Document:

<PAGE>

                                                                    EXHIBIT 10.6

                         DESIGN AND PURCHASE CONTRACT
                         ----------------------------

Dated April 11, 1997
Revised on May 12, 1997
Revised on June 4, 1997

Between
          Philsar Electronics, Inc. 81 Metcalfe St., Ottawa, Canada, K1P 6K7
          (fax: 1-613-567-5578; E-mail: pll@philsar.com)
          (herein "Philsar")

And
          Vectorlink, Inc. 41638 Christy St., Fremont, California, 94538, USA,
          (fax: 1-510-353-6021; E-mail: rod@vectorlink.com)
          (herein "Vectorlink")

1.   Product

The item which is the subject of this agreement is the "VRF1" down converter
ASIC to be developed jointly by Vectorlink and Philsar, as more particularly
described in Schedule A (herein the "Product").

2.   Background

The VRF1 is to be architected by Vectorlink with proprietary architecture to
work in concert with the Vectorlink 12 channel GPS digital signal processing
chip.

3.   Scope of Design Work

Philsar will implement the architecture into a single down converter chip, using
Philsar proprietary RF technology, according to the specifications in Schedule
A and according to the timetable set out in Schedule B. Design work shall
include the production of 25 prototype copies of the Product.

4.   Payment of Design Costs

Vectorlink will pay Philsar a portion of the NRE costs in respect of the
Product. The portion of NRE cost to be paid by Vectorlink is $70,000 USD which
shall be payable against Philsars' invoices in the amounts and according to the
timetable set out in Schedule C.

5.   Post Contract Design Changes

Vectorlink may request modifications or alterations to the scope of the design
work at any time prior to the taping out of the design of the Product.
Vectorlink shall have 30 days fol-

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997
page 1

CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTIONS OF THIS DOCUMENT HAVE
BEEN REDACTED AND HAVE BEEN SEPARATELY FILED WITH THE COMMISSION.
<PAGE>

lowing delivery of the prototype Product to request further design work. Philsar
shall not be obligated to accept any modification or alteration request nor
perform any additional design work, remedial or otherwise, unless and until a
mutually agreeable supplementary NRE budget has been established.

6.   Intellectual Property

6.1.      Vectorlink Ownership

Vectorlink retains ownership in the system architecture of the VRF1 chip, which
includes the following Vectorlink proprietary properties:

1- Frequency plan with unambiguous carrier phase down converting
2- Cascadable LO frequency to facilitate relative phase measurement,
3- Cascadable down converter chips to facilitate phase measurement at the
digital signal processing chip for purpose of attitude determination.

6.2.      Philsar Ownership

Philsar shall retain ownership of the Mask Work Plots and other representations
of the chip topography of the Product. Nothing in this agreement shall confer
upon Vectorlink any right or license, express or implied, in respect of the
Product Mask Work Plots or chip topography.

6.3.      Indemnity

Except in the case where the specifications in Schedule A were provided by
Vectorlink, Philsar shall indemnify Vectorlink with respect to any claim, action
or proceeding against Vectorlink alleging that the Product infringes any patent,
copyright, trademark or other intellectual property of a third party in Canada
or the United States. In addition to its obligation to indemnify, Philsar may,
at its option, (i) defend the action or proceeding, (ii) procure the right for
Vectorlink to use the Product, (iii) replace or modify the Product to be free of
the infringement claim, or (iv) require Vectorlink to return the Product and
refund the purchase price plus a reasonable allowance for use, damage and
obsolescence. This indemnity shall apply only if Vectorlink gives Philsar prompt
notice of the claim, action or proceeding, cooperates fully with Philsar in
its defence and settlement thereof and only to the extent that the claim, action
or proceeding relates specifically and directly to the Product. It shall not
apply merely because the Product was incorporated by Vectorlink into an item in
respect of which the action or proceeding was brought.

7.   Production Purchase Commitments

7.1. Minimum Purchase Commitment

Vectorlink agrees to purchase and Philsar agrees to sell a minimum of 25,000
units of the Product during the Production Period. For the purposes of this
paragraph, "Production Period" means the 12 months next following the month in
which the prototypes are delivered

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997
page 2
<PAGE>

or any additional post delivery design work that is requested pursuant to
paragraph 4 is completed. If Vectorlink fails to take delivery of the full
25,000 units during the Production Period, Vectorlink shall pay Philsar, as
liquidated damages and not as penalty, the sum of US$250,000 less an allowance
equal to US$10.00 for each unit that Vectorlink does purchase during the
Production Period. If Vectorlink fails to Purchase more than 3,000 units in any
3 month period during the Production Period, then, Philsar may, after a 30
notice to remedy, deem that Vectorlink intends to purchase the balance of the
Production Period and invoice Vectorlink accordingly.

7.2. Price

The unit price for the production Product shall be calculated according to the
price quantity matrix set out in Schedule D. At any time after the 24th month
following delivery of the Prototype Philsar may change the price quantity matrix
in Schedule D upon 30 days notice to Vectorlink but Vectorlink may elect to
terminate rather than accept the new price.

7.3. Terms of Sale

Vectorlink shall provide Philsar with Purchase Orders specifying quantity and
delivery date with price as set out in Schedule D. All Purchase Orders shall be
delivered to Philsar not less than 30 days prior to the delivery date specified
therein. All Product shall be sold and delivered for factory and Vectorlink
shall assume title and risk at that point even if Philsar selects the shipper.
Payment of the purchase price is due 30 days after delivery. Vectorlink is
liable for all sales taxes, duties and like charges that may be imposed on the
sale or delivery of the goods and services to be provided by Philsar under this
agreement. Vectorlink shall pay interest at the rate of 1% per month on all
overdue mounts.

8.   Exclusivity

Vectorlink shall have the exclusive right to purchase the Product for 24 months
after the receipt of first production delivery, unless the agreement is
terminated earlier.

The exclusivity is subject to Vectorlink notifying Philsar that it wishes to
proceed with production pursuant to paragraph 7.1.

After this 24 month period, Philsar may sell the chip to third parties. However,
Philsar agrees to give to Vectorlink a preference in terms of cost and delivery
schedule over eventual third party customers, according to an agreement to be
arrived at between both no later than 21 months after the first production
quantity order from Vectorlink.

Philsar may not licence the Vectorlink proprietary properties to any third party
without the prior approval from Vectorlink.

9.   Announcement and Advertising

Vectorlink and Philsar will jointly announce the product at a mutually agreeable
time with mutually agreeable contents.

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997
page 3
<PAGE>

Following such announcement and taking the exclusivity to Vectorlink of item 8,
Philsar may advertise the existence of this agreement and of the resulting chip
in trade journals or other public media and shall give prior notice to
Vectorlink of any advertisement that names or otherwise identifies Vectorlink.

Following the initial announcement, Vectorlink may advertise the existence of
this agreement and of the resulting chip in trade journals or other public
media.

10.    Warranties and Limitation of Liability

10.1.  Design

Philsar shall design a chip that meets the specifications in Schedule A. Philsar
makes no representations or warranties that the Product shall be usable by
Vectorlink or at all. All NRE costs paid by Vectorlink during the design phase
shall be deemed to be earned by Philsar upon receipt by Vectorlink of Product
that meet the specifications of Schedule A. Philsar shall be able to rely upon
any drawings, test results or specifications provided by Vectorlink for
incorporation into the design of the Product. Vectorlink warrants that any
software provided by it to Philsar in connection with this agreement will be
free of viruses, worms or similar programs or instructions.

10.2.  Production

Philsar will replace any items of the Product which do not meet the
specifications of Schedule A. Philsar's liability in respect of such defective
items shall be limited to replacement only and shall not extend to any direct,
indirect or consequential loss or damage resulting from the use of defective
items by Vectorlink or the customers of Vectorlink, whether or not such defects
are latent. Philsar shall be under no obligation to accept warranty claims from
Vectorlink's customers. The foregoing warranties ace exhaustive of Philsar's
warranties to Vectorlink and Vectorlink's customers and in lieu of any other
warranty express or implied including, without limitation, any warranty of
merchantability or fitness for purpose.

10.3.  Prototype Testing

Within the context of this contract, Philsar will prepare a document describing
test procedures that will be performed on the prototypes, including functional
and performance tests. Philsar will be responsible to perform the functional
tests at its facility. Functional testing definition is included as schedule E
of this document.

Two evaluation boards will be provided by Philsar with provisions to interface
with Vectorlink's development receiver. The evaluation boards will have the
functionality of the brass boards delivered by Philsar, plus the added
functionality of dual AGC and power control.

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997
page 4
<PAGE>

11.  Vectorlink use to Conform with Laws

Vectorlink represents and warrants to Philsar that the Product and any item into
which it may become incorporated by or on behalf of Vectorlink will not be used,
sold or delivered by Vectorlink in violation of the laws of Canada or the
jurisdiction in which Vectorlink is situate or to which it or its parent may be
subject. In the event that Philsar has reasonable grounds to believe that such
violation has occurred or is about to occur, Philsar may terminate the contract
and stop further shipments but such stoppage or termination shall not remove
Vectorlink's liability to pay for any Product already delivered.

12.  Force Majeure

Philsar or Vectorlink shall be excused from failure to perform its obligations
under this agreement if such failure is due to events beyond its control. Such
events include, but are not limited to strikes, accidents, fires, wars,
government actions and interruptions in the delivery of parts, raw materials or
Product.

If such an event occurs, Philsar or Vectorlink may elect to terminate the
agreement, in which case the provisions of paragraph 11 shall apply, or suspend
it for a period of up to 30 days. The party terminating the agreement shall
promptly notify the other party of the occurrence of such an event and its
election. Vectorlink shall remain liable for timely payment for Product already
in transit.

13.  Termination

Philsar may terminate this agreement if Vectorlink fails to pay any amount
payable by it hereunder or otherwise perform its obligations or an event of
force majeure occurs. In addition to any other remedies available to Philsar at
law or in equity upon termination, Vectorlink shall remain liable for all
Product already in transit and, except in the case of termination for force
majeure, for Philsar's reasonable expenses with respect to any work in progress
at the time of termination.

Vectorlink may terminate this agreement if Philsar fails to deliver according to
Schedule A, Schedule B or otherwise perform its obligation or an event of force
majeure occurs. Vectorlink's liability shall be limited in accordance with
Schedule B and Schedule C.

14.  Notices

All notices shall be in writing and sent by fax or E-mail to the addresses set
out on page 1. All notices shall be deemed to have been received on the next
business day after they were sent.

15.  Governing Law

This agreement shall be governed by the laws of Ontario, Canada without regard
to any

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997
page 5
<PAGE>

conflict of law principles and any proceedings to resolve disputes shall be
heard by the courts of Ontario.

16.  Headings

The parties agree that the headings are for convenience only and do not form
part of this agreement.

17.  Entire Agreement

Except for the Non-Disclosure Agreement between the parties dated April 7, 1997
and any purchase order delivered by Vectorlink, which are incorporated into this
agreement by reference, this agreement contains the entire agreement between
the parties.

Dated at Ottawa, Canada this 4th day of June 1997.

Philsar Electronics, Inc         Vectorlink, Inc.

/s/ Luc Lussier                  /s/  Rodric C. Fan
-----------------------------    -------------------------------------
per: Luc Lussier, President      per: Rodric C. Fan, President 6/11/97

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997
page 6
<PAGE>

                                   Schedule A

                                    Product
                                 Specifications

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997
page 7
<PAGE>

The VRF1 ASIC is an integrated ASIC front end dual conversion L-band RF receiver
developed for a Global Positioning System (GPS) Receiver application. The device
is packaged in a TQFP package and is designed to operate from a 3 volt supply.

The input is the L1 (1575.42 MHz) GPS signal. The output is a downconverted,
bandpass 2-bit quantized signal ready for digital signal processing.

The VRF1 contains a low noise amplifier (LNA), two frequency multipliers
(mixer), voltage controlled oscillator (VCO), fixed frequency dividers,
automatic gain control, crystal oscillator and proper filter and input matching
impedances.

FEATURES

 .    Fully Integrated GPS receiver
 .    Total Gain of over 120 dB
 .    Integrated LNA
 .    Supply voltage range + 2.7 to +3.7 V DC
 .    Low Profile TQFP Package
 .    Sign and Magnitude digital outputs
 .    Cascadable for multi-Rx fronts ends
 .    On chip PLL and oscillators
 .    C/A Code compatible

APPLICATIONS

GPS (Global Positioning System)

STRUCTURE

Bipolar Silicon Monolithic IC

ABSOLUTE MAXIMUM RATINGS

(Non Simultaneous)

Max Supply Voltage                            +5V
Max RF Input                               +15dBm
Max voltage on any pin                        tbd
Storage temperature                 -65C to +150C
Operating Junction Temperature                tbd
10.2028 MHz Ref. Input                    1.5 Vpp

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997
page 8
<PAGE>

Product Description

The block diagram of the VRF1 ASIC is shown in Figure 1 below. The VRF1 ASIC
consists of a number of functional blocks as described below.

LNA Options

External LNA

Internal LNA

1st RF Strip

External 2nd IF Filter

1st IF Strip

External 1st IF Filter

2nd IF Strip

AGC Control

Analog to Digital Converter

Phase Locked Loop Synthesizer

Loop Filter and Resonator

Reference Outputs

Crystal Oscillator Options

Power Down Capability

Power On Reset Function

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997
page 9
<PAGE>

                                    (Image)

Figure 1 - Preliminary Block Diagram of the VRF1

Note: The pin-out may be modified up to the Critical Design Review

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997
page 10
<PAGE>

Electrical Characteristics

The Electrical Characteristics are guaranteed over the following operating
conditions

Temperature                                  -40(Degrees)C to + 85(Degrees)C
Supply Voltage                               +2.7 to +3.7V
Test Conditions (Unless Otherwise stated):
Supply Voltage:                              +2.7 to +3.7V
Test Temperature:                                     +25(Degrees)C

                      Table 1: Electrical Characteristics

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------------------
            CHARACTERISTIC               SYMBOL           MIN            TYP     MAX          UNITS      TEST CONDITIONS
============================================================================================================================
<S>                                      <C>              <C>          <C>       <C>          <C>        <C>
 POWER SUPPLY

 Normal Mode
 DC current drain                        Icc                                35     60         mA         PD Set High

 Stand-by                                Icc                                 1                mA         PD set low
-----------------------------------------------------------------------------------------------------------------------------------
 LNA1

 Input Signal Frequency                  /f/in1                        1575.42                MHz
 Output Frequency (1st IF)               /f/in1                        1575.42                MHz
 Noise Figure                            FLNA1                             2.5    3.5         dB
 Input Impedance                         Z\\inLNA1\\                        50                Omega      VSWR = 2.0 max
 Output Impedance                        Z\\0\\LNA1                         50                Omega      VSWR = 2.0 max
 Output Third Order Intercept Point      II3P\\LNA1in\\       -10           -2                dBm
 Output 1dB Gain Comp Point              P1\\LNA1in\\         -20          -12                dBm
 Radiated LO Emission                    LOLNA1                                   -40         dBm        Output Power at 1530MHz at
 Gain                                    GLNA1                 12           18                dB         Pin 30
-----------------------------------------------------------------------------------------------------------------------------------
 1st RF STRIP

 Input signal frequency                  /f/in               1400      1575.42   1750         MHz
 Output Frequency (1st IF)               f1                               45.0                MHz        LO1 = 1530.42 MHz
 Conversion Gain                         G1                    20           30                dB         fin=1575.42MHz+/- 50MHz
 Noise Figure                            F1                   2.5            5      8         dB         Zs = 50Omega
 Input Impedance                         Z\\in\\                            50                Omega      VSWR = 2.0
 Differential Output Impedance           Z\\0\\1                           600                Omega      VSWR = 2.0
 RF Input Image Rejection                IR1                   20           30                dB\\c\\
 Input 1dB Gain Compression              P1\\in\\             -50          -40                dBm        Referred to the input
 Point
 LO Radiated Emission                    LO1                                                  dBm        Output Power at 1530MHz at
                                                                                  -10                    Pin 34

-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997
page 11
<PAGE>

<TABLE>
<CAPTION>
                                         Table 1: Electrical Characteristics
--------------------------------------------------------------------------------------------------------------------------
             CHARACTERISTIC                  SYMBOL      MIN        TYP        MAX        UNITS         TEST CONDITIONS
==========================================================================================================================
<S>                                       <C>            <C>       <C>          <C>       <C>           <C>
 1st IF STRIP

 Input Frequency (1st IF)                   fl                     45.0                   MHz           LO1 = 1530.42 MHz
 Output Frequency (2nd IF)                  f2                     6.014                  MHz           LO2 = 51.014 MHz
 Conversion Gain                            G2            20       30                     dB            f1=45.0 MHz
 Differential Input Impedance               Z1\\in\\               600                    kOmega
 Differential Output Impedance              Z1\\out\\              1            5         Omega
 Input Compression Point                    P2                     75                     mVrms
 IF Strip 3dB Bandwidth                     BW1           50       55                     MHz

 --------------------------------------------------------------------------------------------------------------------------
 2nd IF STRIP

 Input Frequency                            IF2                    6.014                  MHz
 Output Frequency                           IF2                    6.014                  MHz
 IF2 Output Amplitude                       VIF2                   100                    mV\\pp\\
 IF2 1dB Bandwidth                          BW2           6.5      7            8         MHz

 Maximum Gain                               G3                     75                     dB
 Gain Control Range                         G\\AGC-R\\    30       40                     dB
 AGC Time Constant                          /t/AGC                 1            3         ms
 Output Variation over 30dB Range           G3B                    1            2         dB
 Input Control Voltage                                    0.5                   2.5       V

 2 BIT ADC
 Sign Duty Cycle                                                   50                     %
 Magnitude Duty Cycle                                     25       30           35%       %             at 100 mV\\pp\\

--------------------------------------------------------------------------------------------------------------------------
</TABLE>

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997

Page 12
<PAGE>

<TABLE>
<CAPTION>
                                                Table 1: Electrical Characteristics
-----------------------------------------------------------------------------------------------------------------------------------
             CHARACTERISTIC                  SYMBOL       MIN      TYP        MAX        UNITS         TEST CONDITIONS
===================================================================================================================================
 <S>                                        <C>           <C>     <C>          <C>       <C>          <C>
 PLL SYNTHESIZER

 LO1 Phase Noise                            P\\n\\                                                    1530.42 MHz
           1 kHz                                                   -  68       -  65      dBc/Hz      Note: Does not include
           10 kHz                                                  -  75       -  70      dBc/Hz            spurious signals
           100 kHz                                                 -  90       -  85      dBc/Hz
           1 MHz                                                   -  110      -  100     dBc/Hz
           5 MHz                                                   -  120      -  100     dBc/Hz
           10 MHz                                                  -  120      -  100     dBc/Hz
                                            f\\LO\\       1400       1530        1700     MHz
 VCO Free Running Frequency                 P\\spur\\              -   50                 dBc
 VCO Spurious                                                                                         Note:
                                            f\\ref\\
 Reference Input                            T\\Iock\\              10.2028                MHz         fLO1=150xf\\ref\\
 PLL Lockup Time                                                   5             10       msec
                                                                                 1530
 REFERENCE OSCILLATOR                       f\\ref\\
 Reference Oscillator Frequency                                    10.2028                MHz         Fundamental Mode Crystal
                                            V\\refin\\    70                              mV\\rms\\   Note:
 Input Reference Signal Level                                      100                                External Reference, AC coupled
                                                                                                      Note:
 Reference Output                           V\\refout\\   70
   Level                                                           100                                mV\\rms\\
   Output Impedance                                                600                                Omega
   Output Non-Inverting relative
   to Reference Oscillator                                                                            Must drive 4 loads of input
   Output Driving Capability                                                                          impedence
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
Philsar - Vectorlink Design and Purchase Contract
Revised June 1997

Page 13
<PAGE>

<TABLE>
<CAPTION>
                                               Table 1: Electrical Characteristics
-------------------------------------------------------------------------------------------------------------------------------
            CHARACTERISTIC                 SYMBOL       MIN        TYP       MAX     UNITS             TEST CONDITIONS
===============================================================================================================================
<S>                                        <C>          <C>        <C>       <C>     <C>     <C>
 DIGITAL INTERFACES                                                                           Note All Digital interfaces are
                                                                                              3V TTL levels unless otherwise
                                                                                              specified
 2 BIT ADC
 Sample Clock Input Frequency                                     7.6521      9       MHz     Typically f\\CLK38\\/5
 Sign Output 3V TTL                                               3V TTL                       Note:
 Magnitude Output 3 V TTL                                         3V TTL                       Note
 Sample Clock to Sign/Mag Output           t\\MAG\\               20                  ns
 Sample Clock Level                                               3V TTL

 AGC CONTROL(TBD)

 POWER CONTROL
 Power Down Time                           t\\PD\\                3                   mus     Note: For Each of 3 Modes
 Power Up Time                             t\\PU\\                20                  ms

 CLOCK OUTPUTS
 CLK10                                     f\\REF\\               10.2028             MHz     f\\REF\\
 CLK38                                     f\\CLK38\\             38.2605             MHz     3.75xf\\REF\\
 CLK51                                     f\\CLK51\\             51.014              MHz     5xf\\REF\\
                                                                                              Note: Clock Output are
                                                                                                    100 mV rms / 600omega
-------------------------------------------------------------------------------------------------------------------------------
</TABLE>
Philsar - Vectorlink Design and Purchase Contract
Revised June 1997

Page 14
<PAGE>

                                   Schedule B

                                   Time Table

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997

Page 15
<PAGE>

     The target delivery dates are shown in Table 2 below.

                              Table 2: Time Table
     -------------------------------------------------------------------
               Event Description                     Target Completion
                                                           Date
     ===================================================================
     Contract Award                                   December 23, 1996
     -------------------------------------------------------------------
     Detailed Specification Sheet                     January 10, 1997
     -------------------------------------------------------------------
     Preliminary Design Review                        February 5, 1997
     -------------------------------------------------------------------
     Critical Design Review                           May 15, 1997
     -------------------------------------------------------------------
     Tape Out                                         June 30, 1997
     -------------------------------------------------------------------
     First Shipment of 25 Untested Part               August 30, 1997
     Accelerated Schedule (see Note 1 below)
     -------------------------------------------------------------------
     First Shipment of 25 Untested Part               September 15, 1997
     Normal Schedule
     -------------------------------------------------------------------
     Shipment of 2 Test Sets (see Note 3 below)       September 30, 1997
     -------------------------------------------------------------------
     Shipment of 25,000 minimum First Purchase*       12 Weeks ARO
     -------------------------------------------------------------------
     Volume Production Orders                         10 - 12 Weeks ARO
     -------------------------------------------------------------------

     * These target dates assume no second design cycle. Should such second
     cycle be warranted, new target dates will be accepted by both parties.

     Note 1
     There may be an option to have a first shipment of parts using a special
     ordering process to speed-up first delivery. This process will add $25,000
     (twenty five thousand dollars) to the NRE cost of the project.

     Note 2
     These dates may vary by up to 30 days for unintended reasons. In such a
     case, these target dates will be deemed as met for contractual purpose.

     Note 3
     These Test Sets will include:
          - Test PCB Evaluation Board,
          - Documentation Package including data sheets and a brief description
             of the board set up and use requirements
          - Successful Test Report including test data verifying all
             specification items of the VRF1 GPSRx ASIC Specification in
             Schedule A.

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997

Page 16
<PAGE>

                                  Schedule C

                                    Payment
                                   Schedule

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997

Page 17
<PAGE>

     The Schedule of Payments for the Project is shown in Table 3 below:

<TABLE>
<CAPTION>
                                               Table 3: Schedule of Payment
        ---------------------------------------------------------------------------------------------------------
                                 Event                               Target Date                 Payment in
                                                                                                 US Dollars
        =========================================================================================================
         <S>                                                      <C>                            <C>
         Contract Award                                           December 23, 1996                 -
        ---------------------------------------------------------------------------------------------------------
         Detailed Specifications                                  January 10, 1997                  [**]
        ---------------------------------------------------------------------------------------------------------
         Preliminary Design Review                                February 5, 1997                  [**]
        ---------------------------------------------------------------------------------------------------------
         Critical Design Review                                   May 15, 1997                      [**]
        ---------------------------------------------------------------------------------------------------------
         Tape Out to Production                                   June 30, 1997                     [**]
        ---------------------------------------------------------------------------------------------------------
         Shipment of Prototypes - Normal Schedule                 September 15, 1997
        ---------------------------------------------------------------------------------------------------------
         Shipment of Prototypes - Accelerated Schedule            August 30, 1997
        ---------------------------------------------------------------------------------------------------------
         Shipment of 2 Test Sets                                  September 30, 1997                [**]
        ---------------------------------------------------------------------------------------------------------
         Start of Shipment of 25,000 minimum First Purchase*      November 1, 1997                  [**]
        ---------------------------------------------------------------------------------------------------------
         Total Contract Value                                                                       [**]

                                                                                                   or [**] for
                                                                                                   accelerated
                                                                                                   schedule
        ---------------------------------------------------------------------------------------------------------
</TABLE>

     * This target date assumes no second design cycle and a 12 week delay ARO.
     Should such second cycle be warranted, new target dates will be accepted by
     both parties. The payment schedule is to be consistent with item 7.3 of
     this agreement.

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997

Page 18

** CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.

<PAGE>

                                  Schedule D

                                Price/Quantity
                                    Matrix

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997

Page 19
<PAGE>

The Unit Price of the parts will vary according to the cumulative number of
parts ordered, as shown in table 4 below:

                 Table 4: Price/Quantity Matrix
---------------------------------------------------------------
              Quantity                 Unit Price in US dollars
===============================================================
Initial 25 Untested Prototypes         included in design costs
---------------------------------------------------------------
Minimum Initial Purchase of [*]                 [*]
---------------------------------------------------------------
[*]                                             [*]
---------------------------------------------------------------
[*]                                             [*]
---------------------------------------------------------------
[*]                                             [*]
---------------------------------------------------------------
[*]                                             [*]
---------------------------------------------------------------

These prices are fixed for the period covering the first 24 months following
delivery of the functional prototypes.

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997

Page 20

[*] CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.

<PAGE>

                                   Schedule E

                                 Functionality
                                     Tests

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997

Page 21
<PAGE>

Functionality Test Areas

After receiving the Prototypes from the Foundry, Philsar will perform, in its
facilities or under its direct supervision a series of tests to ensure the
functionality of the prototypes.

1.   Temperature Ranges

The tests will be performed at 3 temperature ranges:

1.1. at -40 degrees Celsius
1.2. at +25 degrees Celsius
1.3. at +85 degrees Celsius

2.   Test to be performed

The following components will be tested, each measuring a specific aspect of the
component for conformance to specifications of Table 5 below:

              Table 5: Functional Test to be Performed by Philsar
------------------------------------------------------------------------------
No       Component under test           Aspects to be measured
==============================================================================
1    LNA                             Gain
                                     Linearity
------------------------------------------------------------------------------
2    Mixer / LNA2                    Conversion Gain
                                     Linearity
                                     Image Suppression
------------------------------------------------------------------------------
3    VCO                             Frequency Range
     (On Spectrum Analyzer only)     Phase Noise
------------------------------------------------------------------------------

4    Frequency Dividers              Functionality
     Output Clocks                   Divide Ratios
------------------------------------------------------------------------------
5    PLL                             Acquire Lock over Temperature Range
------------------------------------------------------------------------------
6    AGC                             Gain Range
                                     Compression Ratio
                                     Output Level
------------------------------------------------------------------------------
7    A/D                             Functionality, Magnitude / Sign, 30% duty
                                     cycle at nominal level
                                     Linearity
------------------------------------------------------------------------------
8    Crystal Oscillator              Frequency, Power
------------------------------------------------------------------------------
9    Power Control                   3 Functional Modes
------------------------------------------------------------------------------

A Report will be submitted to Vectorlink describing the results of the tests.

Philsar - Vectorlink Design and Purchase Contract
Revised June 1997

Page 22<PAGE>

                                                                    EXHIBIT 10.7

                                     [LOGO OF BELL ATLANTIC MOBILE APPEARS HERE]

                                                        CONTRACT NO. ###-##-####

                        JOINT CDPD MARKETING AGREEMENT
                                    between
                               VECTORLINK, INC.
                                      and
                             BELL ATLANTIC MOBILE

================================================================================
                                    PRIVATE
The information contained herein is proprietary and should not be disclosed to
unauthorized persons. It is meant solely for use by authorized Bell Atlantic
Mobile employees and persons employed, retained or consulted by them.

CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTIONS OF THIS DOCUMENT HAVE
BEEN REDACTED AND HAVE BEEN SEPARATELY FILED WITH THE COMMISSION.
<PAGE>

                           JOINT MARKETING AGREEMENT

          THIS JOINT MARKETING AGREEMENT, Contract No. ###-##-####, is made by
and between Cellco Partnership, a Delaware General Partnership, doing business
as Bell Atlantic Mobile, located at 180 Washington Valley Road, Bedminster, NJ
07921 (hereinafter "Bell Atlantic Mobile"), and VECTORLINK, INC., a California
corporation, with its principal place of business at 45635 Northport Loop East,
Fremont, CA 94538 ("Company").

                              W I T N E S S E T H

          WHEREAS, Bell Atlantic Mobile has the ability to offer its current and
prospective customers its wireless data Cellular Digital Packet Data ("CDPD")
services; and

          WHEREAS, Company develops and distributes certain software and
hardware to provide wireless products, services and application solutions to
satisfy particular customer requirements; and

          WHEREAS, the parties have determined that it will be beneficial to
each of them to enter into a definitive agreement to market to their respective
customers and prospective customers technological solutions which meet those
customers' needs and which, to the extent practicable, combine each other's
products and services to provide total wireless data solutions utilizing CDPD
applications; and

          WHEREAS, solutions for the customers and prospective customers of Bell
Atlantic Mobile or Company may require the use of software designed for specific
applications ("Application Software"), which may be provided by Company or by
one or more third parties ("Third-Party Providers"), such as value-added
resellers ("VARs"), independent software vendors ("ISVs") or systems
integrators;

          NOW, THEREFORE, in consideration of the mutual promises and covenants
of the parties as hereinafter set forth, Bell Atlantic Mobile and Company agree
as follows:

          ARTICLE 1 - DEFINITIONS

          "Affiliate" of a person or entity (the "primary party") means another
person or entity which falls within any one or more of the following categories:
(i) a person or entity that is controlled by, controls or is under the same
control as the primary party, or (ii) a subsidiary (whether or not consolidated)
of the primary party, or (iii) an entity of which the primary party is a
subsidiary (whether or not consolidated), or (iv) a person or entity which has a
material ownership interest in the primary party or which manages a significant
portion of the primary party's day-to-day operations, or (v) an entity in which
the primary party has a material ownership interest or which has a significant
portion of its day-to-day operations managed by the primary party.

          "Bell Atlantic Mobile Market Area" means the area designated as the
Bell Atlantic Mobile Market Area in Exhibit A hereto.
                                    ---------

          "Bell Atlantic Mobile Services" includes Existing Bell Atlantic Mobile
Services and Customized Bell Atlantic Mobile Services.

          "Bell Atlantic Mobile Technology" means CDPD.

          "Cellular Digital Packet Data Service ("CDPD")". Cellular radio
service utilizing packet switching technology to transmit data over radio
frequency channels. The raw data rate of CDPD is 19.2 Kilobits per second. It is
a connectionless multi-protocol network service providing peer network wireless
extension to existing data networks.

          "Company Market Area" means the area(s) designated as the Bell
Atlantic Mobile Primary Serving Markets as listed in Exhibit A

                                       1
<PAGE>

          "Company Products" means all products and services offered by Company
to Customers or Prospects from time to time, whether such products or services
are offered to Customers or Prospects directly by Company or indirectly through
third parties or subcontractors, and whether or not Company is the ultimate
supplier or manufacturer of such products or services. The Company Products
include, without limitation, Existing Company Products and Customized Company
Products.

          "Customer" means, at any time, any current customer or client of the
          party in question.

          "Customized Bell Atlantic Mobile Services" means services which can be
provided by Bell Atlantic Mobile using the Bell Atlantic Mobile Technology, but
which are not at the time included in the Existing Bell Atlantic Mobile
Services.

          "Customized Company Products" means products which can be provided by
Company using technology available to it, but which are not at the time included
in the Existing Company Products.

          "Direct Sales Channel" means for any entity all individuals employed
by such entity for the purpose of sales and all sales facilities operated by
such entity (such as communication store outlets, in the case of Bell Atlantic
Mobile), but shall not include independent companies of such entity.

          "Existing Bell Atlantic Mobile Services" means the CDPD services which
Bell Atlantic Mobile markets generally from time to time.

          "Existing Company Products" means the products which Company markets
generally from time to time.

          "Proposal" means any proposal, or any response to requests for
proposal, bid or information, or similar method of offering or marketing
wireless data solutions which do, or reasonably could, include both Bell
Atlantic Mobile Services and Company Products and (to the extent applicable)
Application Software.

          "Prospect" means any Customer or potential Customer to whom a party
hereto has made, or is considering making, a Proposal.

          To "Reasonably Recommend" a product or service means to recommend and
promote such product or service to a Prospect in a manner reasonably designed to
influence the Prospect to purchase the product or service; provided, that an
                                                           --------
obligation to Reasonably Recommend a product or service does not include any
obligation: (a) to promote any product or service if there exists a good faith
belief that the Prospect's requirements would not be addressed as well by such
product or service as they would by some competing product or service or (b) to
continue promoting the product or service if the Prospect indicates an
unwillingness to consider using it.

          "Solutions" means actual or proposed total wireless data solutions to
meet the needs of Prospects, which solutions utilize CDPD applications.

          ARTICLE 2 - JOINT-PROMOTION AND PROPOSALS

          2.7  Recommendation of Bell Atlantic Mobile Services and Company
               -----------------------------------------------------------
     Products. During the term of this Agreement, Company, through its Direct
     --------
     Sales Channel, shall Reasonably Recommend the Bell Atlantic Mobile Services
     in the Company Market Area. During the term of this Agreement, Bell
     Atlantic Mobile, through its Direct Sales Channel, may, but is not required
     to, Reasonably Recommend the Company Products in the Bell Atlantic Mobile
     Market Area.

          2.2  Company Proposals. From time to time during the term of this
               -----------------
     Agreement, whenever Company is considering making a Proposal involving CDPD
     which, in Company's reasonable judgment, may benefit from the inclusion of
     Bell Atlantic Mobile Services, Company

                                       2
<PAGE>

     shall so notify Bell Atlantic Mobile. Upon receipt of such notice, Bell
     Atlantic Mobile shall promptly provide to Company all sales, marketing and
     technical support necessary to enable Company to include in its Proposal,
     to the extent reasonably practical, Solutions using Bell Atlantic Mobile
     Services.

          2.3  Bell Atlantic Mobile Proposals. From time to time during the term
               ------------------------------
     of this Agreement, whenever Bell Atlantic Mobile is considering making a
     Proposal which, in Bell Atlantic Mobile's reasonable judgment, may benefit
     from the inclusion of Company Products, Bell Atlantic Mobile may so notify
     Company. Upon receipt of such notice, Company shall promptly provide to
     Bell Atlantic Mobile all sales, marketing and technical support necessary
     to enable Bell Atlantic Mobile to include in its Proposal, to the extent
     reasonably practical, Solutions using Company Products. Bell Atlantic
     Mobile may request Company's support, but Bell Atlantic Mobile shall be
     under no obligation to recommend Solutions containing Company Products to
     Bell Atlantic Mobile's Prospects.

          2.4  Responsibilities Upon Acceptance of Proposals Which Include Bell
               ----------------------------------------------------------------
               Atlantic Mobile Services and Company Products.
               ----------------------------------------------

          (a)  Upon a Prospect's acceptance of a Company Proposal which includes
     Bell Atlantic Mobile Services or a Bell Atlantic Mobile Proposal which
     includes Company Products, Company and Bell Atlantic Mobile shall cooperate
     with each other in implementing the Proposal, which cooperation shall be
     deemed a joint marketing effort hereunder.

          (b) Should the Proposal be one which contemplates that Company or a
     Third-Party Provider is the prime contractor to the Customer, Bell Atlantic
     Mobile may choose to act as a subcontractor pursuant to a subcontracting
     agreement to be entered into between Company or such Third-Party Provider
     and Bell Atlantic Mobile. Should the Proposal be one which contemplates
     that Bell Atlantic Mobile or a Third-Party Provider is the prime contractor
     to the Customer, Company shall act as a subcontractor pursuant to a
     subcontracting agreement to be entered into between Bell Atlantic Mobile or
     such Third-Party Provider and Company. Upon entry into a subcontracting
     agreement or similar form of agreement relating to an accepted Proposal,
     such agreement shall thereafter govern the rights and obligations of the
     parties thereto with respect to the subject matter thereof, except as the
     parties may otherwise agree in writing.

          (c) Should the Proposal be one which contemplates that each of Company
     and Bell Atlantic Mobile (and, if appropriate, one or more Third-Party
     Providers) shall separately contract with the Customer, then each of
     Company and Bell Atlantic Mobile shall negotiate in good faith to enter
     into its own contract with such Customer (each, a "Customer Contract").
     When both Company and Bell Atlantic Mobile have entered into such Customer
     Contracts, neither of them shall have any obligations to one another with
     respect to the subject matter thereof other than the obligation of
     reasonable coordination with each other to implement the agreed upon
     Solution; provided, that if either of them, by acts or omissions
               --------
     constituting bad faith or gross negligence under the Customer Contract by
     which such party is bound, directly or indirectly causes the other party to
     suffer any losses or damages, the party causing such loss or damage shall
     be liable to the party which has been harmed to the extent that the loss or
     damage was reasonably foreseeable.

          2.5  Training Regarding Bell Atlantic Mobile Services and Technology.
               ---------------------------------------------------------------
     During the term hereof, in order to enhance Company's ability to Reasonably
     Recommend Bell Atlantic Mobile Services and its ability to create Proposals
     which could include Bell Atlantic Mobile Services, and thereby to further
     advance both parties' purposes hereunder, Bell Atlantic Mobile shall make
     available to Company information designed to enhance Company's
     understanding of the functions and advantages of the Bell Atlantic Mobile
     Services and the Bell Atlantic Mobile Technology.

                                       3
<PAGE>

          2.6  Training Regarding Company Products and Technology. During the
               --------------------------------------------------
     term hereof, in order to enhance Bell Atlantic Mobile's ability to
     Reasonably Recommend Company Products and its ability to create Proposals
     which could include Company Products, and thereby to further advance both
     parties' purposes hereunder, Company shall make available to Bell Atlantic
     Mobile information designed to enhance Bell Atlantic Mobile's understanding
     of the functions and advantages of the Company Products.

          2.7  Obligation to Reasonably Recommend. During the term hereof,
               ----------------------------------
     Company shall not recommend any provider of CDPD other than Bell Atlantic
     Mobile to any Customer or potential Customer in the Bell Atlantic Mobile
     Market Area, except in such instances in which: (a) Company has first
     Reasonably Recommended Bell Atlantic Mobile Services and the Company
     Customer has refused to deal with Bell Atlantic Mobile, or (b) Company
     believes in good faith that it is unable to Reasonably Recommend the Bell
     Atlantic Mobile Services to such Customer or potential Customer for any of
     the reasons set forth in the definition of "Reasonably Recommend" elsewhere
     in this Agreement and, to the extent practical, it has notified Bell
     Atlantic Mobile of that reason and given Bell Atlantic Mobile an
     opportunity to respond.

          2.8  Telemarketing Services
               ----------------------

          In the event Company conducts telemarketing services on behalf of Bell
     Atlantic Mobile, the following shall apply:

          (a)  Company agrees to conduct its telemarketing services on behalf of
     Bell Atlantic Mobile, in accordance with all applicable Federal, State and
     local laws and regulations governing advertising, marketing practices and
     the transaction of its business by telephone. These include, but, are not
     limited to, the Telephone Consumer Protection Act of 1991, the
     Telemarketing and Consumer Fraud and Abuse Prevention Act of 1994 and the
     Telemarketing Sales Rule of 1995, all Consumer Protection Acts, all
     tariffs, and any rules and procedures of any governmental body or Bell
     Atlantic Mobile relating to the sale of CRS or the sale, lease,
     installation, warranty service or repair of Equipment, as well as the laws
     and regulations of the United States Postal Service, Federal Communications
     Commission, Federal Trade Commission and the Federal Reserve Board.

          Further, to the extent Company records or monitors its calls, it will
     give appropriate notification and gain consent of participants in such
     calls to such monitoring and recording. Company shall provide Bell Atlantic
     Mobile with a plan and an audited report to demonstrate it is complying
     with these laws, rules and regulations.

          (b) When making outbound telemarketing calls on behalf of Bell
     Atlantic Mobile, Company shall only use representatives who have attended
     and completed training by Bell Atlantic Mobile in Bell Atlantic Mobile
     specific practices and procedures and the Bell Atlantic Mobile price plans
     Company is authorized to offer. After completion of the Bell Atlantic
     Mobile training, the representative shall be fully capable of handling Bell
     Atlantic Mobile calls in a professional, knowledgeable manner, and in
     strict conformance with Bell Atlantic Mobile's practices and procedures.
     The representatives shall also be knowledgeable about applicable Bell
     Atlantic Mobile price plan offers. Training provided by Bell Atlantic
     Mobile will be based on the applicable portions of Bell Atlantic Mobile's
     Training manual, including but not limited to, Bell Atlantic Mobile's
     products, services, price plans and coverage areas. Company employees who
     attend the training will be asked to sign a Bell Atlantic Mobile attendance
     sheet

          (c) No contract between Bell Atlantic Mobile and a Subscriber shall
     exist until the Service Form is accepted and approved by Bell Atlantic
     Mobile and the service has been activated.

                                       4
<PAGE>

          Company will provide its outbound calling list to Bell Atlantic Mobile
     for approval ("Preapproved List"). The list provided by Company will be on
     a 3.5 disk in Excel format and should include the customer's name and
     address, phone number and social security number (if available). Bell
     Atlantic Mobile will review the list and indicate which customers should
     not be called either because they are Bell Atlantic Mobile's current
     customers or are on Bell Atlantic Mobile's "Do Not Call List"). Bell
     Atlantic Mobile will normally return the list to Company within one (1)
     week after receipt. Company agrees that it shall also maintain and honor a
     "Do Not Call" List.

          (d) Company shall not use a Voice Response Unit during its performance
     under this Agreement.

          (e) In the event Company is providing similar services to other
     wireless providers in markets not covered by this Agreement, Company agrees
     that its operators who handle Bell Atlantic Mobile calls will not share the
     same working areas as Company operators who handle other wireless
     providers' calls. Further, Company shall ensure that other wireless
     providers: (1) will not be allowed access to Bell Atlantic Mobile
     documentation, (2) will not be allowed access to the area(s) where
     representatives are handing Bell Atlantic Mobile calls, and (3) will not
     have the ability to listen in to operator's who are handling Bell Atlantic
     Mobile's calls. Further, Company employees shall be instructed to keep Bell
     Atlantic Mobile information secure when not in use. Company shall also
     ensure that its employees are aware of the restrictions contained in the
     Agreement executed by the parties concerning Company's employees obligation
     not disclose Bell Atlantic Mobile information. Prior to implementation,
     Company will provide to Bell Atlantic Mobile for Bell Atlantic Mobile's
     prior approval, Company's plan to ensure that Company will comply with this
     Section 2.8.

          (f) Company will bear all costs for providing telemarketing services,
     including, but not limited to:

               (1) The time spent by its representatives during Bell Atlantic
          Mobile training; (2) all costs related to fulfillment of the
          Subscriber's order, and (3) all costs relating to the furnishing and
          maintaining of adequate and appropriate equipment, personnel ancillary
          services, office facilities, support facilities and all necessary
          hardware and software required to perform telemarketing sales.

          ARTICLE 3 - TECHNOLOGY DEVELOPMENT AND OWNERSHIP

          3.1  Technology Development. Bell Atlantic Mobile and Company may
               ----------------------
     cooperate with each other from time to time in developing new technology,
     new applications of existing technology and/or new products or product
     lines in order to further their mutual interests hereunder. Except as
     otherwise provided herein, neither party shall be under any obligation to
     the other to engage in such development.

          3.2  New Technology Ownership. In each event when the parties desire
               ------------------------
     to work together to develop new technology or new products, they shall
     negotiate to reach agreement on the ownership rights of each of them in the
     technology or products which are to be developed.

          ARTICLE 4 - REPRESENTATIONS AND WARRANTIES OF COMPANY AND BELL
                      ATLANTIC MOBILE

          4.1  Company hereby represents and warrants to Bell Atlantic Mobile as
     follows:

               4.1.1  Sufficient Rights; No Infringement. Company owns the
                      ----------------------------------
                      entire right, title and interest in and to the Company
                      Products, or has sufficient rights therein, to utilize the
                      Company Products for the purposes set forth herein.

                                       5
<PAGE>

                      The Company Products to be used in accordance with any
                      arrangements contemplated by this Agreement do not
                      infringe or violate any United States patents or any
                      copyright, trademark, trade secret or other intellectual
                      property rights and there are no claims of any such
                      infringement or violation.

               4.1.2  Authority. Company has the requisite authority to enter
                      ---------
                      into this Agreement and to perform all of its obligations
                      hereunder.

          4.2  Bell Atlantic Mobile hereby represent and warrants to company as
     follows:

               4.2.1  Sufficient Rights: No Infringement. Bell Atlantic Mobile
                      ----------------------------------
                      owns the entire right, title and interest in and to the
                      Bell Atlantic Mobile Services and Bell Atlantic Mobile
                      Technology, or has sufficient rights therein, to utilize
                      the Bell Atlantic Mobile Services and the Bell Atlantic
                      Mobile Technology for the purposes set forth herein.
                      Neither the Bell Atlantic Mobile Services nor the Bell
                      Atlantic Mobile Technology is to be used in accordance
                      with any arrangements, contemplated by this Agreement
                      infringe or violate any United States patents or any
                      copyright, trademark, trade secret or any other
                      intellectual property rights and there are no claims of
                      any such infringement or violation.

               4.2.2  Authority. Bell Atlantic Mobile has the requisite
                      ---------
                      authority to inter into this Agreement and to perform all
                      of its obligations hereunder.

          ARTICLE 5 - RELATIONSHIP OF THE PARTIES

          Each of the parties hereto will act as, and will be, independent
          contractors in all aspects of their performance of this Agreement.
          Neither party will act or have authority to act as an agent for the
          other party for any purpose whatsoever. Nothing in this Agreement will
          be deemed to constitute or create a joint venture, partnership,
          franchise, pooling arrangement, or other formal business entity or
          fiduciary relationship between Company and Bell Atlantic Mobile.

          ARTICLE 6 - NON-DISCLOSURE

          6.1  Non-Disclosure of Agreements. Neither party will make any
               ----------------------------
     disclosure regarding the terms of this Agreement or the business
     arrangements described herein without obtaining the prior written consent
     of the other party; provided, however, that (i) the parties may communicate
                         --------  -------
     with Customers and Prospects to the extent reasonably required to perform
     hereunder (but will obtain prior written approval of the other party hereto
     before identifying such party in advertisements, mass mailings or general
     publicity); (ii) each party will be permitted to make such disclosures as
     are required by legal or regulatory requirements applicable to, and beyond
     the reasonable control of, the party; and (iii) either party may disclose
     the terms of this Agreement and the business arrangements described herein
     to employees of their affiliates who have a need to know.

          6.2  Confidential Information. The parties recognize that in the
               ------------------------
     course of negotiating and performing this Agreement both parties have had
     and will continue to have access to certain confidential or proprietary
     information belonging to the other and each desires that any such
     confidential and proprietary information remain confidential. Each party
     agrees that, both during the term hereof and for a period of two (2) years
     after the termination of this Agreement such party will use the same means
     it uses to protect its own confidential proprietary information, but in no
     event less than reasonable means, to prevent the disclosure and to protect
     the confidentiality of both (i) written information received from the other
     party which is marked or identified as confidential, and (ii) oral or
     visual information identified as confidential at the time of disclosure
     which is summarized in writing and provided to the other party in such
     written form promptly after

                                       6
<PAGE>

     such oral or visual disclosure ("Confidential Information"). The foregoing
                                      ------------------------
     will not prevent either party from disclosing Confidential Information
     which belongs to such party that is (i) already known by the recipient
     party without an obligation of confidentiality, (ii) publicly known or
     becomes publicly known through no unauthorized act of the recipient party,
     (iii) rightfully received from a third party, (iv) independently developed
     by the recipient party without use of the other party's Confidential
     Information, (v) disclosed without similar restrictions to a third party by
     the party owning the Confidential Information, (vi) approved by the other
     party for disclosure, or (vii) required to be disclosed pursuant to a
     requirement of a governmental agency or law so long as the disclosing party
     provides the other party with notice of such requirement prior to any such
     disclosure. Nothing herein shall restrict Company from disclosing to a
     third party that it has an exclusive relationship with Bell Atlantic
     Mobile.

          6.3  Remedies. Each party acknowledges that the other would suffer
               --------
     irreparable damage in the event of any breach of the provisions of this
     Article 6. Accordingly, in such event, a party will be entitled to
     temporary, preliminary and final injunctive relief, as well as any other
     applicable remedies at law or in equity against the party who has breached
     or threatened to breach this Article 6.

          6.4  No Rights Granted. Nothing contained in this Agreement shall be
               -----------------
     construed as granting or conferring any rights by license or otherwise in
     any Confidential Information disclosed to the receiving party. All
     Confidential Information shall remain the property of the disclosing party
     and shall be returned by the receiving party to the disclosing party upon
     request. All notes, abstracts, memoranda, or other documents prepared by
     receiving party which contain Confidential Information or any discussion
     thereof, shall be destroyed or returned to the disclosing party upon
     written request. If the parties hereto decide to enter into any licensing
     arrangement regarding any Confidential Information or present or future
     patent claims disclosed hereunder, it shall only be done on the basis of a
     separate written agreement between them. No disclosure of any Confidential
     Information hereunder shall be construed a public disclosure of such
     Confidential Information by either party for any purpose whatsoever.

          6.5  Limitation on Obligations. The furnishing of Confidential
               -------------------------
     Information hereunder shall not obligate either party to enter into any
     further agreement of negotiation with the other or to refrain from entering
     into an agreement or negotiation with any other party.

          ARTICLE 7 - TERM AND TERMINATION

          7.1  Term and Termination.
               --------------------

          (a)  Subject to the termination provisions below, this Agreement shall
     take effect upon execution of this Agreement by the parties and shall
     continue for a period of one (1) year from the date hereof. Thereafter,
     this Agreement may be extended for four (4) additional one-year terms
     unless terminated by either party within sixty (60) days of the expiration
     of the then current Term. The initial Term, including all renewal Terms,
     shall not exceed five years.

          (b)  This Agreement may be terminated by either party with or without
     cause by giving thirty (30) days' prior written notice to the other (to the
     attention of the person signing this Agreement on behalf of such other
     party). Upon material breach or default under this Agreement by either
     party, if the other party gives notice of such breach or default and the
     same is not reasonably susceptible of cure within thirty (30) days, then
     without limitation of any other remedy available hereunder, the non-
     defaulting party may terminate this Agreement immediately by delivery of a
     notice of termination simultaneously with the notice of default or at any
     time thereafter. This Agreement may be immediately terminated without prior
     written notice at the option of Bell Atlantic Mobile in the event that
     Company violates any of the conditions of Article 6 relating to the
     Confidential Information of Bell Atlantic Mobile or Company shall have
     ceased business, been adjudged bankrupt or insolvent, made an assignment
     for the benefit of creditors, and/or filed for a petition in bankruptcy or
     reorganization.

                                       7
<PAGE>

          (c)  Following expiration or termination of this Agreement, except for
     the obligations of the parties set forth in Section 7.3 below, the parties
     will have no further obligation or responsibility to each other.

          7.2  No Waiver. The right of either party to terminate this Agreement
               ---------
     hereunder shall not be affected in any way by its waiver of or failure to
     take action with respect to any previous default.

          7.3  Survival of Obligations upon Expiration of Term or Termination of
               -----------------------------------------------------------------
     Agreement. (a) All obligations of the parties arising hereunder and
     ---------
     relating to any Proposal or joint Customer relationship existing on the
     date of expiration or termination (other than obligations to recommend or
     jointly market each others products and services) shall continue in full
     force and effect subsequent to and notwithstanding the termination or
     expiration of this Agreement until all such obligations are satisfied in
     full. The termination or expiration of this Agreement shall in no way
     affect the rights and obligations of Bell Atlantic Mobile and Company under
     any then existing subcontracting agreement or similar form of agreement
     between the parties, except to the extent set forth therein.

          (b)  All representations, warranties and covenants of the parties set
     forth in Section 4 and Section 8 shall survive the termination of this
     Agreement for a period of two (2) years (the "Two-Year Period"); provided,
                                                                      --------
     however. (i) if a claim or allegation of infringement of any U.S. patent or
     -------
     any trademark, copyright, trade secret or other intellectual property right
     is made during the Two-Year Period, then, with respect to such claim or
     allegation, the indemnification provisions of Sections 8.1 and 8.2 shall
     survive beyond the Two-Year Period and (ii) if a claim or demand covered by
     Section 8.3 is made within the Two-Year Period, then, with respect to such
     claim or demand, the indemnification provisions of Section 8.3 shall
     survive beyond the Two-Year Period.

          ARTICLE 8 - INDEMNIFICATION

          8.1  (a) Company shall defend, indemnify, and hold harmless Bell
     Atlantic Mobile, Bell Atlantic Mobile's parent and affiliated companies,
     and Bell Atlantic Mobile's customers (each, an "Indemnified Party") for any
     loss, damage, expense or liability that may result by reason of any
     infringement or claim or allegation of infringement of any U.S. patent or
     any trademark, copyright, trade secret or other intellectual property
     rights by any Company Products furnished by Company hereunder or as
     contemplated hereby and to pay costs, expenses, attorney's fees and damages
     resulting from any claim, suit, settlement or judgment provided that
     Company is notified promptly in writing of the claim or suit and at
     Company's request and at its expense is given control of said suit and at
     Company's expense, all reasonable requested assistance for defense of same.
     If a settlement or judgment involves a license, then Company shall obtain
     for Indemnified Party and pay the cost of the license, so that Company
     Products furnished hereunder or as contemplated hereby will be licensed.

          (b)  If the use, manufacture or sale of any Company Product furnished
     hereunder is claimed to infringe any U.S. patent or any trademark,
     copyright, trade secret or other intellectual property rights, at
     Indemnified Party's option and at no expense to Indemnified Party, Company
     shall obtain for the Indemnified Party the right to use or sell said
     product(s) or technology or shall substitute an equivalent product
     reasonably acceptable to Indemnified Party and extend this indemnity
     thereto or shall accept the return of the product(s) and reimburse
     Indemnified Party the purchase price therefor. This indemnity extends to
     any claim or suit based upon any infringement or alleged infringement of
     any patent, trademark, copyright, trade secret or other intellectual
     property rights by the reasonably foreseeable alteration by Indemnified
     Party of any Company Products furnished by Company and by the foreseeable
     combination of any Company Products furnished by Company and other
     elements.

                                       8
<PAGE>

          (c)  Bell Atlantic Mobile shall, at Company's expense, respond to, and
     assist Indemnified Party to respond to, informal and formal allegations,
     notifications and claims of infringement in connection with the Company
     Products furnished hereunder or as contemplated hereby and will assist
     Indemnified Party to evaluate the merits of any such allegations,
     notifications or claims.

          (d)  Company further agrees to coordinate, form, and cooperate in a
     joint defense with other vendors that supply products to Indemnified Party
     that are alleged to commonly or in combination with the Company Products
     furnished hereunder or as contemplated hereby, infringe. The joint defense
     shall, at its expense, retain independent outside counsel acceptable to
     Indemnified Party to coordinate defense activities. Indemnified Party
     retains the right to implead Company in the event of a suit.

          8.2  (a) Bell Atlantic Mobile shall defend, indemnify, and hold
     Company harmless, and Company's customers ("Indemnified Party") for any
     loss, damage, expense or liability that may result by reason of any
     infringement or claim or allegation of infringement of any U.S. patent or
     any trademark, copyright, trade secret or other intellectual property
     rights by Bell Atlantic Mobile's CDPD service furnished by Bell Atlantic
     Mobile hereunder or as contemplated hereby and to pay costs, expenses,
     attorney's fees and damages resulting from any claim, suit, settlement or
     judgment provided that Bell Atlantic Mobile is notified promptly in writing
     of the claim or suit and at Bell Atlantic Mobile's request and at its
     expense is given control of said suit and at Bell Atlantic Mobile's
     expense, all reasonable requested assistance for defense of same. If a
     settlement or judgment involves a license, then Bell Atlantic Mobile shall
     obtain for Indemnified Party and pay the cost of the license, so that the
     CDPD service furnished hereunder or as contemplated hereby will be
     licensed.

          (b)  If the use, manufacture or sale of Bell Atlantic Mobile's CDPD
     Service furnished hereunder is claimed to infringe any U. S. patent or any
     trademark, copyright, trade secret or other intellectual property rights,
     at Indemnified Party's option and at no expense to Indemnified Party, Bell
     Atlantic Mobile shall obtain for the Indemnified Party the right to use or
     sell said product(s) or technology or shall substitute an equivalent
     service.

          (c)  Company shall at Bell Atlantic Mobile's expense, respond to, and
     assist Indemnified Party to respond to, informal and formal allegations,
     notifications and claims of infringement in connection with the service
     furnished hereunder or as contemplated hereby and will assist Indemnified
     Party to evaluate the merits of any such allegations, notifications or
     claims.

          8.3  Payment of Taxes and Indemnification. (a) Neither Party nor their
               ------------------------------------
     officers and directors and its associated personnel and employees (all
     hereinafter designated "employees") shall be deemed to be employees of the
     other Party, it being understood that each Party is an independent
     contractor for all purposes and at all times; and each Party shall be
     solely responsible for the withholding or payment of all Federal, State and
     local Personal Income Taxes, Social Security, Unemployment and Sickness
     Disability Insurance and other payroll taxes with respect to its employees,
     including contributions from them when and as required by law.

          (b)  Company shall defend, indemnify, and save harmless Bell Atlantic
     Mobile and its successors and assigns and its employees and Companys and
     their heirs, legal representatives and assigns from any and all claims or
     demands whatsoever, including the costs, expenses and reasonable attorney's
     fees incurred on account thereof, that may be made by any person,
     specifically including, but not limited to, employees of the Company,
     including, but not limited to, claims for bodily injury (including death to
     persons) or damage to property (including theft) occasioned by or alleged
     to have been occasioned by the negligent acts or omissions of the Company,
     its employees or persons furnished by the Company whether negligent or
     otherwise.

          (c)  Company shall defend Bell Atlantic Mobile at Bell Atlantic
     Mobile's request, against any such liability, claim or demand. The
     foregoing indemnification shall apply whether Company or Bell Atlantic
     Mobile defends such suit or claims and whether the death, injury or
     property

                                       9
<PAGE>

     damage is caused by the sole acts or omissions of Company or by the
     concurrent acts or omissions of Bell Atlantic Mobile or Company hereunder.
     Bell Atlantic Mobile agrees to notify Company promptly of any written claim
     or demands against Bell Atlantic Mobile for which Company is responsible
     hereunder.

          ARTICLE 9 - GENERAL

          9.1  Assignment. This Agreement is personal to each party hereto and
               ----------
     neither may assign or otherwise transfer its rights or delegate its duties
     hereunder without the prior written consent of the other, which consent
     shall not be unreasonably withheld; provided, however, either party may
                                         --------  -------
     upon written notice to the other assign any of its rights or obligations
     hereunder to (i) an Affiliate of the assigning party or (ii) the purchaser
     of or successor in interest to all or substantially all of the assigning
     party's assets, unless (with respect to an assignment by Company) in the
     reasonable judgment of Bell Atlantic Mobile the assignee is a competitor of
     Bell Atlantic Mobile, in which case the assignment by Company shall not be
     valid or binding between the parties without Bell Atlantic Mobile's prior
     written consent.

          9.2  Amendment. This Agreement and the Schedules and Exhibits attached
               ---------
     hereto shall not be deemed or construed to be modified, amended, or waived,
     in whole or in part, except by written agreement duly executed by the
     parties to this Agreement.

          9.3  Severability. In the event any provision hereof shall be deemed
               ------------
     invalid or unenforceable by any court or governmental agency of competent
     jurisdiction, such provision shall be deemed severed from this Agreement
     and all remaining provisions shall be afforded full force and effect as if
     such severed provision had never been a provision hereof.

          9.4  Execution. At the time of execution of this Agreement, the
               ---------
     parties shall cause their authorized officers to execute two original
     copies of this Agreement. One executed copy together with one initialed
     copy of each schedule and attachment hereto shall be maintained by the
     parties at their respective offices.

          9.5  Compensation. Bell Atlantic Mobile shall pay Company Compensation
               ------------
     ("Commission") upon the sale of both Bell Atlantic Mobile Services and
     Company Products to any Customer procured through the joint efforts of
     Company in accordance with the attached Exhibit B, which may be amended by
     Bell Atlantic Mobile from time to time, provided that Company is in full
     compliance with the terms and conditions herein. Bell Atlantic Mobile, may
     from time to time, add, delete or modify any Bell Atlantic Mobile services
     and the Commission paid for same. Each Customer shall be deemed effective
     upon activation by Bell Atlantic Mobile.

          Any Compensation or other fee paid by Bell Atlantic Mobile under this
     Agreement shall not be contested by Company unless Company shall provide
     Bell Atlantic Mobile, in writing within five (5) business days of issuance
     of said Compensation or fee, notice that Company in good faith believes
     payment to be incorrect, a detailed statement of the reason why the Company
     believes there is an error, and all documentation including but not limited
     to: Service orders, inventory reports, canceled checks, installment sales
     contracts, etc., in support of Company's belief. Any objections not raised
     by Company in this manner will be deemed waived. If this Agreement is
     terminated for any reason, Bell Atlantic Mobile may withhold payment of
     Compensation then due until all matters relating to the termination of the
     agency, including equipment, and matters under any other agreement between
     the parties, are settled. Company agrees that at any time, regardless of
     whether this Agreement is in effect or not, any past due monies owed to
     Bell Atlantic Mobile by Company under this Agreement or any other agreement
     between the parties may be offset against commissions or other monies due
     Company. If there are insufficient amounts owed Company by Bell Atlantic
     Mobile to effect such reduction, Company shall pay any remaining sums to
     Bell Atlantic Mobile immediately upon demand.

                                       10
<PAGE>

          9.6  Injunctive Relief. The parties recognize and agree that money
               -----------------
     damages are an inadequate remedy for breach of the provisions contained in
     Article 9.17 and Article 6 above, and further recognize that such breach
     would result in irreparable harm to the party against whom such breach is
     committed. Therefore, in the event of a breach or threatened breach of any
     such provision, the breaching party may be enjoined from engaging in any
     activity proscribed by such provision by a court of competent jurisdiction.
     Injunctive relief pursuant to this Section shall be in addition to all
     remedies available at law or in equity to a party arising from a breach of
     such provisions by the other party.

          9.7  Excused Performance. The parties shall not be liable for any
               -------------------
     failure to perform under this Agreement or any default due to fire,
     electrical failure, flood or similar act of God, embargo, or governmental
     restrictions which prevent the parties from performing in the normal and
     usual course of their businesses, provided they undertake diligent action
     to cure such failure and mitigate damage.

          9.8  Headings. The headings of this Agreement are intended solely for
               --------
     the convenience of reference and shall be given no effect in the
     construction of this Agreement.

          9.9  Number, Gender. The masculine, feminine, singular and plural of
               --------------
     any word or words shall be deemed to include and refer to the gender and
     number appropriate in the context.

          9.10 Notices. Except as otherwise provided in this Agreement, all
               -------
     notices or other communications which are required or permitted hereunder
     shall be in writing and shall be valid and sufficient if delivered by: a)
     registered or certified mail, postage prepaid; b) hand delivery; c)
     overnight courier prepaid; or d) via facsimile transmission upon electronic
     confirmation of receipt, as follows:

     To                  Bell Atlantic Mobile:
                         180 Washington Valley Road
                         Bedminster, NJ 07921
                         Attn.:  Robert J. Hirsh, Director
                                 Wireless Data Distribution
                                 Phone: (908) 306-7520
                                 Facsimile: (908) 306-7541

     With a Copy to:     Bell Atlantic Mobile
                         180 Washington Valley Road
                         Bedminster, NJ 07921
                         Attn.:  Frances Dommeleers
                                 Staff Director, Contracts
                                 Phone: (908) 306-7197
                                 Facsimile: (908) 306-4304

     To Company:         VECTORLINK, INC.
                         45635 Northport Loop East
                         Fremont, CA 94538
                         Attn.:  Mr. Amin Mufti
                                 Vice President, Business Development
                         Phone:      510 668-1638
                         Facsimile:

          9.11 Counterparts. This Agreement may be signed in two or more
               ------------
     counterparts, each of which shall be considered an original and which
     shall, taken together, constitute this Agreement.

                                       11
<PAGE>

          9.12  No Third Party Beneficiaries. Nothing in this Agreement is
                ----------------------------
     intended or shall be construed or interpreted to give any person or entity
     other than the parties hereto any legal or equitable right, remedy or claim
     under or in respect of this Agreement or any provision contained herein.

          9.13  Governing Law. Except to the extent explicitly provided
                -------------
     elsewhere in this Agreement, the interpretation and enforcement of this
     Agreement and all matters arising out of or relating to it shall be
     governed by New York law without regard to its conflict of laws provisions
     except for New York General Obligations Law Section 5-1401.

          9.14  Entire Agreement. This Agreement constitutes the entire
                ----------------
     agreement between the parties with respect to the subject matter hereof and
     supersedes all prior and contemporaneous agreements and understandings,
     whether written or oral, between the parties with respect to such subject
     matter, and there are no representations, understandings or agreements
     relating to this Agreement that are not fully expressed in this Agreement.

          9.15  Procedure. (a) Each party shall appoint an individual from its
                ---------
     organization to interface with the other party on any issues arising out of
     this Agreement, and shall promptly notify the other party of such
     appointment.

          (b) Bell Atlantic Mobile and Company will jointly conduct an annual
     meeting to review performance and set objectives for the new year.

          9.16  No Representations. Bell Atlantic Mobile shall not make any
                ------------------
     representations or warranties to third parties on behalf of Company, and if
     any such representations or warranties are made they shall have no force or
     effect on Company. Company shall not make any representations or warranties
     to third parties on behalf of Bell Atlantic Mobile, and if any such
     representations or warranties are made they shall have no force or effect
     on Bell Atlantic Mobile.

          9.17  Publicity and Advertising. Without the prior written consent of
                -------------------------
     the other party, no party hereto will disclose to any person the terms and
     conditions of this Agreement, except as may be required by law and then
     only in compliance with ARTICLE 6.2. Each party shall submit to the other
     party advertising, sales promotion, press releases and other publicity
     matters relating to the other party wherein such party's name or marks is
     mentioned or language from which the connection of said names or marks
     therewith may be inferred or implied. A party shall not publish or use such
     advertising, sales promotion, press releases, or publicity matters without
     the other party's prior written approval

          9.18  Trademark Guidelines. Each party hereto shall comply with the
                --------------------
     other party's reasonable written guidelines with respect to the use of such
     other party's trademarks and/or service marks and for quality control in
     connection with such party's trademarked products and/or service-marked
     services.

          Company shall not register or otherwise use the Licensed Marks or any
     portion of the Licensed Marks as an Internet domain name or other Internet
     address.

          9.19  DAMAGES. NO SPECIAL, CONSEQUENTIAL OR INDIRECT DAMAGES MAY BE
                -------
     AWARDED TO EITHER PARTY IN CONNECTION WITH ANY ACTION, CLAIM, PROCEEDING OR
     SUIT ARISING HEREUNDER.

                                       12
<PAGE>

          ARTICLE 10 - ACKNOWLEDGEMENTS AND REPRESENTATIONS.

          Company acknowledges that it has not received or relied upon, any
     guaranty, express or implied, as to the amount of commissions or other
     revenue that it may earn as a result of its relationship with Bell Atlantic
     Mobile. Company represents and warrants that:

          (a) the execution, delivery and/or performance of this Agreement will
     not conflict with or result in any breach of any provision of the charter
     or by-laws of Company or any agreement, contract or legally binding
     commitment or arrangement to which Company is a party, and

          (b) Company is not subject to any limitation or restriction
     (including, without limitation, noncompetition, and confidentiality
     arrangements) which would prohibit, restrict or impede the performance of
     any of Company's obligations under this Agreement.

          This Agreement does not constitute a joint venture, partnership,
     employment, or similar relationship among the parties, and, unless
     authorized in writing, neither Bell Atlantic Mobile nor Company shall make
     any express or implied agreements, guarantees or representations, or incur
     any indebtedness or obligations, in the name of or on behalf of the other.

          ARTICLE 11 - INDEPENDENT INVESTIGATION

          BELL ATLANTIC MOBILE AND COMPANY ACKNOWLEDGE THEY HAVE READ THIS
AGREEMENT AND UNDERSTAND AND ACCEPT THE TERMS, CONDITIONS, AND COVENANTS
CONTAINED HEREIN AS BEING REASONABLY NECESSARY TO MAINTAIN BELL ATLANTIC
MOBILE'S HIGH STANDARDS FOR SERVICE. COMPANY ACKNOWLEDGES AND UNDERSTANDS THAT
BELL ATLANTIC MOBILE MAY AT ANY TIME ALSO BE ENGAGED DIRECTLY OR INDIRECTLY
THROUGH ITS DIRECT SALES FORCE, COMPANIES, OTHER RETAILERS, OR OUTLETS OF ANY
KIND, IN SOLICITING POTENTIAL SUBSCRIBERS FOR THE SERVICE OR OTHER SERVICES OR
PRODUCTS OR FOR THE SALE, LEASE, INSTALLATION, REPAIR, OR SERVICING OF EQUIPMENT
IN THE MARKET. COMPANY ALSO ACKNOWLEDGES AND UNDERSTANDS THAT BELL ATLANTIC
MOBILE MAY SELL THE SERVICE TO OTHERS WHO MAY RESELL IT. COMPANY HAS
INDEPENDENTLY INVESTIGATED THE SERVICE OR EQUIPMENT SALES BUSINESS AND THE
PROFITABILITY (IF ANY) AND RISKS THEREOF AND IS NOT RELYING ON ANY
REPRESENTATION, GUARANTEE, OR STATEMENT OF BELL ATLANTIC MOBILE OTHER THAN AS
SET FORTH IN THIS AGREEMENT.

          IN PARTICULAR, COMPANY ACKNOWLEDGES THAT BELL ATLANTIC MOBILE HAS NOT
REPRESENTED: (A) COMPANY'S PROSPECTS OR CHANCES FOR SUCCESS SELLING SERVICES
UNDER THIS AGREEMENT: (B) THE TOTAL INVESTMENT THAT COMPANY MAY NEED TO MAKE TO
OPERATE UNDER THIS AGREEMENT (BELL ATLANTIC MOBILE DOES NOT KNOW THE AMOUNT OF
THE TOTAL INVESTMENT THAT MAY BE REQUIRED FOR THIS PURPOSE); OR (C) THAT IT WILL
LIMIT ITS EFFORTS TO SELL SERVICE OR ESTABLISH OTHER COMPANIES OR RETAILERS IN
THE AREA.

          COMPANY ALSO ACKNOWLEDGES THAT BELL ATLANTIC MOBILE HAS NOT
REPRESENTED TO IT THAT: (A) BELL ATLANTIC MOBILE WILL PROVIDE LOCATIONS OR
ASSIST COMPANY TO FIND LOCATIONS TO PROMOTE THE SALE OF SERVICE UNDER THIS
AGREEMENT; (B) BELL ATLANTIC MOBILE WILL PURCHASE ANY PRODUCTS MADE BY COMPANY
THAT ARE IN ANY WAY ASSOCIATED WITH THE SERVICE SOLD BY COMPANY UNDER THIS
AGREEMENT; (C) COMPANY WILL DERIVE INCOME FROM THE SALE OF BELL ATLANTIC
MOBILE'S SERVICES UNDER THIS AGREEMENT, OR BELL ATLANTIC MOBILE WILL REFUND ANY
PAYMENTS MADE BY COMPANY TO BELL ATLANTIC MOBILE UNDER THIS AGREEMENT; OR (D)
BELL ATLANTIC MOBILE WILL PROVIDE A SALES OR MARKETING PROGRAM THAT WILL ENABLE
COMPANY TO DERIVE INCOME UNDER THIS AGREEMENT.

                                       13
<PAGE>

          COMPANY FURTHER ACKNOWLEDGES THAT BELL ATLANTIC MOBILE HAS NOT MADE
ANY REPRESENTATIONS. REGARDING: (A) THE QUANTITY OR QUALITY OF SERVICE TO BE
SOLD BY COMPANY OTHER THAN AS STATED IN THIS AGREEMENT; (B) THE PROVISION BY
BELL ATLANTIC MOBILE TO COMPANY OF TRAINING AND MANAGEMENT ASSISTANCE; (C) THE
AMOUNT OF PROFITS, NET OR GROSS, THAT COMPANY CAN EXPECT FROM ITS OPERATIONS
UNDER THIS AGREEMENT; (D) THE SIZE (OTHER THAN THE GEOGRAPHIC AREA), CHOICE
POTENTIAL, OR DEMOGRAPHIC NATURE OF THE MARKET IN WHICH BELL ATLANTIC MOBILE'S
SERVICE IS AVAILABLE OR THE NUMBER OF OTHER RETAILERS OR COMPANYS THAT ARE OR
MAY IN THE FUTURE OPERATE IN THAT AREA, OR (E) THE TERMINATION, TRANSFER OR
RENEWAL PROVISIONS OF THIS AGREEMENT OTHER THAN AS SET FORTH IN THE AGREEMENT.
COMPANY ACKNOWLEDGES THAT IT UNDERSTANDS THAT IT WILL NOT OBTAIN ANY EXCLUSIVE
RIGHTS UNDER THIS AGREEMENT EITHER WITH RESPECT TO TERRITORY OR OTHERWISE, AND
UNDERSTANDS THAT BELL ATLANTIC MOBILE MAY APPOINT OTHER COMPANYS OR RETAILERS IN
THE MARKET AFFECTED BY THIS AGREEMENT. COMPANY ALSO ACKNOWLEDGES THAT BELL
ATLANTIC MOBILE CANNOT CALCULATE IN ADVANCE THE TOTAL AMOUNT THAT BELL ATLANTIC
MOBILE WILL PAY TO COMPANY UNDER THIS AGREEMENT AS THAT AMOUNT DEPENDS ON THE
QUANTITY OF SERVICE THAT SUBSCRIBERS PURCHASE FROM BELL ATLANTIC MOBILE.

          ARTICLE 12 - LIMITED LIABILITY

          NEITHER PARTY SHALL BE LIABLE TO OTHER PARTY FOR ANY CONSEQUENTIAL,
INCIDENTAL, INDIRECT, PUNITIVE, OR SPECIAL DAMAGES, INCLUDING, BUT NOT LIMITED
TO LOST PROFITS, LOST BUSINESS, OR OTHER COMMERCIAL OR ECONOMIC LOSS, WHETHER
SUCH DAMAGES ARE CLAIMED FOR BREACH OF CONTRACT, NEGLIGENCE OR OTHERWISE AND
WHETHER OR NOT SUCH PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

          13.  DISPUTE RESOLUTION AND ARBITRATION.

               13.1.  Coverage. This Section 13 governs all disputes, claims, or
                      --------
          causes of action between the parties. It applies not only to all
          alleged disputes, claims, or causes of action arising out of or
          relating to this Agreement, but to all other alleged disputes, claims,
          or causes of action between the parties that may currently exist or
          that may in the future arise for any reason.

               13.2.  Written Notice Required. Neither party may pursue any
                      -----------------------
          alleged dispute, claim, or cause of action against the other party,
          except to the extent that emergency injunctive relief or a temporary
          restraining order may be necessary, without first providing written
          notice of such alleged dispute, claim, or cause of action to such
          other party.

               13.3.  Negotiation Required. Within thirty days of any written
                      --------------------
          notice of an alleged dispute, claim, or cause of action, the parties
          shall meet in person or by telephone and attempt in good faith to
          negotiate a resolution of the alleged dispute, claim, or cause of
          action. If the party receiving the notice refuses to meet, this thirty
          day period will be deemed to have expired upon the date of such
          refusal, if it is sooner than thirty (30) days.

               13.4.  When Arbitration May Be Initiated. Except as provided in
                      ---------------------------------
          Subsections 13.2 and 13.6, no arbitration or action may be commenced
          with respect to any alleged dispute, claim, or cause of action until
          the period prescribed in Subsection 13.3 has expired. If, upon the
          expiration of such period (or such longer period to which the parties
          may have agreed in writing in seeking in good faith to negotiate a
          resolution of the alleged dispute, claim, or cause of action) no
          negotiated resolution has been reached, the party that gave notice may
          initiate arbitration.

                                       14
<PAGE>

               13.5.  Tolling and Confidentiality During Negotiation. From the
                      ----------------------------------------------
          date of any written as prescribed notice in Subsection 13.2 until
          expiration of the negotiation period as prescribed in Subsection 13.4,
          any statutes of limitations applicable to the alleged dispute, claim,
          or cause of action described in such notice shall be tolled. No
          admission, statement, or document by either party made as part of an
          attempt in good faith to negotiate pursuant to Subsection 13.3 may be
          used in any fashion in any arbitration or action. Any such admission,
          statement, or document by either party shall be deemed confidential
          and made pursuant to any applicable settlement privilege. The making
          of any such admission, statement, or document shall not, however,
          preclude the admission of any evidence that would otherwise be
          admissible in an arbitration or action.

               13.6.  Arbitration. Arbitration shall be the exclusive means of
                      -----------
          resolving any alleged dispute, claim, or cause of action between the
          parties that cannot be resolved by negotiation as prescribed in
          Subsection 13.3. Neither party may commence any action in any court
          except to enforce this obligation to arbitrate, enforce any
          arbitration award, or in aid of arbitration to the extent that
          emergency injunctive relief or a temporary restraining order may be
          necessary to prevent irreparable injury or preserve the status quo
          pending decision of an issue by an arbitrator or arbitrators.

               13.7.  Arbitration Rules. Any arbitration and counterclaim in
                      -----------------
          arbitration between the parties shall be initiated under and governed
          by the Wireless Industry Arbitration Rules (the "WIA Rules") of the
          American Arbitration Association (the "AAA"), as modified by this
          Agreement and any other written modification to which both parties
          agree.

                      13.7.1. Any arbitration shall be held in New York City.

                      13.7.2. If either party commences arbitration in the
               manner described above, the dispute will be subject to expedited,
               binding arbitration before three (3) independent arbitrators
               familiar with the wireless telecommunications industry. Such
               arbitration shall be held in New York City, New York pursuant to
               the American Arbitration Association ("AAA") Rules in effect at
               the time of the dispute. Each party shall select one (1)
               arbitrator within twenty (20) days of initiation of arbitration.
               The two (2) arbitrators selected shall in turn select a third
               arbitrator. If the arbitrators selected by the parties cannot
               agree on a third arbitrator, the third arbitrator shall be
               selected from the AAA's Commercial Panel, Telecommunications
               Panel or Large/Complex Case Panel as provided by the WIA Rules.

                      13.7.3. No fast track arbitration as defined in the WIA
               Rules shall be available or applied to either party.

                      13.7.4. No arbitration pursuant to this Section 13 may
               proceed on a class basis, or be consolidated with any other
               arbitration, without the written consent of both parties.

                      13.7.5. Any arbitration award may be reviewed pursuant to
               Rule L-6 of the WIA Rules.

                      13.7.6. Judgment may be entered on any final arbitration
               award in any court of competent jurisdiction.

                      13.7.7. No arbitration award may include any award of
               attorney's fees (except as may be required by any statute
               preempting the Federal Arbitration Act to such extent), punitive
               damages, exemplary damages, or treble or other multiple damages.
               No arbitration award may reform or amend this Agreement.

                                       15
<PAGE>

                      13.7.8. Any arbitration award must include a statement by
               the arbitrator or arbitrators of the reasons for the award.

               13.8.  Severance. If any action or judicial proceeding is
                      ---------
          commenced involving the parties, and any alleged dispute, claim, or
          cause of action arises between the parties in such action or
          proceeding, such alleged dispute, claim, or cause of action shall be
          severed for resolution pursuant to the provisions of this Agreement.
          If any third party not subject to the provisions of this Agreement is
          a necessary party to any alleged dispute, claim, or cause of action
          between the parties, and such third party refuses to consent to
          arbitration pursuant to this Agreement, all issues that can be
          resolved without such third party shall remain subject to this
          Agreement and be severed and resolved before any other issues.

               13.9.  The Federal Arbitration Act Applies. This Agreement
                      -----------------------------------
          involves interstate commerce and is subject to the Federal Arbitration
          Act, 9 U.S.C. (S)(S) 1-16. The Federal Arbitration Act preempts any
          inconsistent state or local law, rule, or regulation concerning
          arbitration.

               13.10. Confidentiality. In addition to the provisions of
                      ---------------
          Subsection 13.5, neither party shall disclose to any third party any
          admission, statement, or document of the other produced or used in
          negotiation or arbitration, or disclose to any third party the
          proceedings or outcome of any negotiation or arbitration. This
          Subsection 13.10 shall not preclude disclosure to an arbitrator or
          arbitrators or the AAA or, to the extent such persons agree to be
          bound by this Subsection 13.10, to the parties' parents, subsidiaries,
          affiliates, officers, directors, and professional advisors. This
          Subsection 13.10 also shall not preclude any disclosure required by
          law or disclosure to any third party of the fact and amount of any
          final arbitration award.

               13.11. Waiver of Trial by Jury. In the event that the Resolution
                      -----------------------
          of Disputes/Arbitration Clause is deemed to be not enforceable, with
          respect to any judicial action which may arise under or with respect
          to this Agreement, or any relationship or dealings between the parties
          that arise out of or by virtue of this Agreement, each party agrees to
          waive trial by jury. Company consents to the bringing of any such
          action under this Agreement to New York.

          ARTICLE 14 - CLEAR DISCLOSURE

          Company will only be permitted to activate Customers on Bell Atlantic
Mobile service under the following terms and conditions:

          Company shall ensure that each Customer activated by Company has read
and understands the terms and conditions of the Data Service Order under which
Bell Atlantic Mobile will provide service to the Customer.

          Company shall indemnify, defend, and hold Bell Atlantic Mobile
harmless from any and all claims, demands and causes of action whatsoever
asserted against Bell Atlantic Mobile due to a claim that the Customer was not
informed that service activated under the Bell Atlantic Mobile Data Service
Order was subject to its terms and conditions.

                                       16
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement in counterparts on the day and year written below.

CELLCO PARTNERSHIP
by Bell Atlantic Mobile, Inc.
its managing general partner                 VECTORLINK, INC.

By:    /s/ Gary Schulman                     By:  /s/ Amin Mufti
       ---------------------------------          ------------------------------
           (REGIONAL PRESIDENT)

Title: Executive Vice President & COO        Title: VP Business Development
       ---------------------------------            ----------------------------

Name:  Jack D. Plating By Gary Schulman      Name: Amin Mufti
       ---------------------------------           -----------------------------

Date:            6/25/99                     Date:         6/23/99
       ---------------------------------           -----------------------------

                                       17
<PAGE>

                               TABLE OF EXHIBITS
                               -----------------

1)   EXHIBIT A:  AUTHORIZED LOCATIONS

2)   EXHIBIT B:  COMPENSATION

3)   EXHIBIT C:  NON-DISCRIMINATION COMPLIANCE AGREEMENT

4)   EXHIBIT D:  COOPERATIVE ADVERTISING PROGRAM AGREEMENT

5)   EXHIBIT E:  ADVERTISING GUIDELINES FOR SALES AGENTS

                                       18
<PAGE>

                                                                       EXHIBIT A

AUTHORIZED LOCATIONS TO DO BUSINESS:         WASHINGTON/BALTIMORE MSAs and
                                             LICENSED RSAs

================================================================================
                 BELL ATLANTIC MOBILE PRIMARY SERVING MARKETS
--------------------------------------------------------------------------------
Market Name

--------------------------------------------------------------------------------
MSAs Licensed

--------------------------------------------------------------------------------
Washington, DC-MD MSA
Baltimore, MD MSA

--------------------------------------------------------------------------------
RSAs Licensed
--------------------------------------------------------------------------------

Delaware 1 - KENT                               Virginia 10 - FREDERICK (B1)
Maryland 2 - KENT                               Virginia 11 - MADISON
Maryland 3 - FREDERICK                          Virginia 12 - CAROLINE

================================================================================

                                       19
<PAGE>

2.   SPECIFIC LOCATIONS IN WHICH COMPANY IS AUTHORIZED TO DO BUSINESS:

          45635 Northport Loop East
          Fremont, CA 94538

This Agreement shall be effective upon execution by Bell Atlantic Mobile.
     Bell Atlantic Mobile

                                       20
<PAGE>

EXHIBIT B

                          COMPANY COMMISSION SCHEDULE
                          ---------------------------

I. Subject to the terms set forth in Paragraph II, III, and IV below and subject
to change on notice from BAM, the following commission schedule applies:

BAM ("BAM") will pay Company a commission ("Commission") for CDPD Activations in
the Area as set forth in Exhibit A. Company will receive a Residual Usage
Commission for new Subscribers enrolled on BAM's Internet Service or other CDPD
price plans.

Upon the sale of both BAM Services and Company's products to any Customer
procured through the joint efforts of Company and BAM, and provided Company has
committed through Customer's contract to provide:

 .    successful installation of host software and hardware with backend
     connectivity
 .    successful installation of mobile software and hardware with wireless
     connectivity
 .    successful configuring of all software and hardware to BAM Network
     specifications
 .    providing customer with first line Help Desk support
 .    thorough training of host and mobile system users
 .    submission of necessary information to BAM for Subscriber to receive IP
     Address

1.   RESIDUAL USAGE COMMISSION
     -------------------------

       ====================================================================
         Service       Activation          Co-op               Residuals
                       Commission   Advertising Allowance
       --------------------------------------------------------------------
       CDPD Plans          $0                $0                   [*]
       ====================================================================

Upon the sale of BAM's CDPD Services, BAM shall each month pay to Company a
Commission equal to [*] of BAM's collected monthly revenues in BAM's Area
resulting from the sale of BAM CDPD Services only to each Customer ("Residual").
Such monthly revenue shall not include taxes, surcharges or other fees, Access,
Port Charges or Visiting Charges. In no event will BAM have any obligation to
pay in excess of the Residual of its revenue to Company. BAM shall have no
obligation to pay a Residual to Company with respect to services provided by
other CDPD carriers outside of the BAM Market Area, regardless of whether such
services are provided at BAM's request or whether BAM receives any Commission
with respect to such services.

Residual shall be payable monthly following the month in which revenues are
received. BAM shall give Company reasonable financial information relating to
Customers covered by this Commission Agreement for the purpose of ascertaining
the amount of Commission due to Company. The Residual will continue to be paid
for the initial term of this Agreement for the period of time that the
Subscriber remains a BAM Subscriber. Such period of time not to exceed three (3)
years for any given subscriber including any period for which Residual was paid
to Company under any previous agreement between BAM and Company. If any new or
existing Subscriber fails to remain on BAM's CDPD service, for any reason,
Residual payments for that Subscriber shall cease. In the event that this
Agreement expires or is terminated by BAM or Company, for any reason, Residual
payments for all Subscribers shall cease. All Residual payments shall be
adjusted for Subscriber "bad debt" (funds on which Company has been paid
Residuals, but which are then not collected by BAM) and "fraudulent" usage.

BAM shall have no obligation to pay Residual Usage Commission to Company with
respect to services provided by other CDPD carriers outside of the BAM Area,
regardless of whether such services are provided at BAM's request or whether BAM
receives any Commission with respect to such services.

                                       21

* CONFIDENTIAL MATERIAL REDACTED AND FILED SEPARATELY WITH THE COMMISSION.

<PAGE>

2.   CHARGE BACK
     -----------

     If a New Subscriber enrolled by Company does not remain on BAM's CDPD
     service for at least one hundred eighty (180) days or, if during that
     period the New Subscriber's account is not in good standing, then BAM shall
     charge back one hundred [100%] percent of the Residual paid for that
     Subscriber. Good standing shall be defined as those customers whose bill
     has been paid on an "account current" status according to BAM's polices.

3.   CO-OP ADVERTISING ALLOWANCE
     ---------------------------

     For each New Subscriber enrolled, a specified Co-op Advertising Allowance
     will be accrued in a fund managed by BAM according to the specified
     Commission Schedule. These funds will be paid out to the Company to help
     defray advertising and other marketing expenses. A plan outlining specific
     fund uses will be agreed to in writing beforehand by BAM and the Company.
     BAM and the Company will track all funds accrued and the follow Co-op
     policy defined within their local respective BAM region. No Co-op
     Advertising Allowance will be paid on Residual Usage Commission.

4.   OTHER TERMS
     -----------

     In the event that Company (intentionally or unintentionally) receives or
     attempts to receive any Residual, hereunder for any Subscriber more than
     once, Company understands and agrees that no payments whatsoever shall be
     due from BAM.

     The recapture of Residual Usage Commissions owed by Company to BAM, for
     amounts exceeding the accrued Residual Usage Commissions owed to Company by
     BAM, shall survive the expiration or termination of this Agreement.
     Commissions paid are subject to change on notice from BAM.

5.   AUTHENTICATABLE EQUIPMENT
     -------------------------

     All new Activations shall be made on authenticatable Equipment with random
     A-key, supportable by the BAM network. Company shall not receive Commission
     for new Subscribers who activate on non-authenticatable equipment.

                                       22
<PAGE>

II.  Any termination of this Agreement by BAM for cause or due to a breach by
Company, shall result in a forfeiture of any and all rights to a Residual.
However, the charge back of a Residual referred to in this Exhibit B shall
survive the expiration or termination of this Agreement.

III. Payment of a Residual, is subject to verification and Company hereby agrees
and understands that no Residual, payment whatsoever shall be due or payable by
BAM if any of the following occurs: (1) the Subscriber does not remain on BAM's
CDPD service for the applicable time period; (2) the Subscriber's account is not
in good standing; (3) Company has not followed all of BAM's rules and procedures
regarding the enrollment of Subscribers; or (4) Company (intentionally or
unintentionally) receives or attempts to receive payments hereunder for any
Subscriber more than once.

IV.  In the event that BAM makes any payment to Company of any Residual,
hereunder, and such payments are at a later date determined to have been
erroneously made (pursuant to the terms and conditions of this Agreement), BAM
reserves the right to charge back such erroneous payment(s) to Company as a
credit against amounts owed to Company by BAM.

If there are insufficient amounts owed Company by BAM to effect such reduction,
Company shall pay any remaining sums to BAM immediately upon demand.

                                       23
<PAGE>

                                                                       EXHIBIT C

RESERVED ACCOUNTS

                                       24
<PAGE>

Affirmative Action                                                     Exhibit D

[LOGO OF BELL ATLANTIC MOBILE APPEARS HERE]
An Equal Opportunity Employer

                    NON-DISCRIMINATION COMPLIANCE AGREEMENT

To the extent this contract is subject to them, Contractor shall comply with the
applicable provisions of the following: Exec. Order No. 11246, Exec. Order No.
11625, Exec. Order No. 12138, Exec. Order No. 11701, Exec. Order No. 11758,
Section 503 of the Rehabilitation Act of 1973, Section 402 of the Vietnam Era
Veterans' Readjustment Assistance Act of 1974 and the rules, regulations and
relevant Orders of the Secretary of Labor pertaining to the Executive Orders and
Statutes listed above. The following table describes the clauses which are
included in the contract.

                    Annual Contract Value       Clauses
                    ---------------------       -------

                    Under $2,500                5*
                    $2,500 - $10,000            5*, 8
                    $10,000 - $50,000           1,2,5*,6,7,8,9
                    $50,000 - $500,000          1,2,3**,4**,5,6,7,8,9
                    Over $500,000               1,2,3**,4**, 5,6,7,8,9***

1. Equal Employment Opportunity Provisions

      In accordance with Executive Order 11246, dated September 24, 1965, and
      Subpart 22.8 of Subchapter D of Chapter 1 of Title 48 of the Code of
      Federal Regulations as may be amended from time to time, the parties
      incorporate herein by this reference the regulations and contract clauses
      required by those provisions to be made a part of government contracts and
      subcontracts.

2. Certification of Non-segregated Facilities

      The Contractor certifies that it does not and will not maintain any
      facilities it provides for its employees in a segregated manner, or permit
      its employees to perform their services at any location under its control
      where segregated facilities are maintained; and that it will obtain a
      similar certification prior to the award of any nonexempt subcontract.

3. Certification of Affirmative Action Program

      The Contractor affirms that it has developed and is maintaining an
      Affirmative Action Plan as required by Subpart 22.8 of Subchapter D. of
      Chapter 1 of Title 48 of the Code of Federal Regulations.

4. Certification of Filing of Employer Information Reports

      The Contractor agrees to file annually on or before the 31st of March
      complete and accurate reports on Standard Form 100 (EEO-1) or such forms
      as may be promulgated in its place.

5. Utilization of Small Business Concerns and Small Disadvantage Business
Concerns

      (a) It is the policy of the United States that small business concerns
      owned and controlled by socially and economically disadvantaged
      individuals shall have the maximum practicable opportunity to participate
      in performing contracts let by any Federal agency.

      (b) The Contractor hereby agrees to carry out this policy in the awarding
      of subcontractors to the fullest extent consistent with efficient contract
      performance. The Contractor further agrees to cooperate in studies or
      surveys as may be conducted by the United States Small Business
      Administration or the awarding agency of the United States as may be
      necessary to determine the extent of the Contractor's compliance with this
      clause.

      (c) As used in this contract, the term "small business concern" shall mean
      a small business as defined pursuant to Section 3 of the Small Business
      Act and relevant regulations promulgated pursuant thereto. The term "small
      business concern owned and controlled by socially and economically
      disadvantaged individuals" shall mean a small business concern.

          (1)  Which is at least 51 percent owned by one or more socially and
               economically disadvantaged individuals; or, in the case of any
               publicly owned business, at least 51 percent of the stock of
               which is owned by one or more socially and economically
               disadvantaged individuals; and

*Applies only if contract has further subcontracting opportunities.
**Applies only to businesses with 50 or more employees,
***Contractor must also adopt and comply with a small business disadvantaged
business subcontracting plan pursuant to Title 48 of the Code of Federal
Regulations.

                                       25
<PAGE>

          (2)  Whose management and daily business operations are controlled by
               one or more of such individuals;

      The Contractor shall presume that socially and economically disadvantaged
      individuals include Black Americans, Hispanic American, Native Americans,
      Asian-Pacific Americans, Asian-Indian Americans and other minorities, or
      any other individual found to be disadvantaged by the Administration
      pursuant to section 8(a) of the Small Business Act.

      (d) Contractors acting in good faith may rely on written representations
      by their subcontractors regarding their status as either a small business
      concern or a small business concern owned and controlled by socially and
      economically disadvantaged individuals.

6. Utilization of Women-Owned Small Businesses

      (a) "Women-Owned small businesses," as used in this clause, means
      businesses that are at least 51 percent owned by women who are United
      States citizens and who also control and operate the business.

      "Control," as used in this clause, means exercising the power to make
      policy decision.

      "Operate," as used in this clause, means being actively involved in the
      day-to-day management of the business.

      (b) It is the policy of the United States that women-owned small
      businesses shall have the maximum practicable opportunity to participate
      in performing contracts awarded by any Federal agency.

      (c) The Contractor agrees to use its best efforts to give women-owned
      small business the maximum practicable opportunity to participate in the
      subcontracts it awards to the fullest extent consistent with the efficient
      performance of its contract.

7. Affirmative Action for Special Disabled Veterans and Veterans of the Vietnam
   Era

      In accordance with Exec. Order 11701, dated January 24, 1973, and subpart
      22.13 of Subchapter D of Chapter 1 of Title 48 of the Code of Federal
      Regulations, as may able amended from time to time, the parties
      incorporate herein by the reference the regulations and contract clauses
      required by those provisions to be made a part of Government contracts and
      subcontracts.

8. Affirmative Action for Handicapped Workers

      In accordance with Exec. Order 11758, dated January 15, 1974, and Subpart
      221.4 of Subchapter D of Chapter 1 of Title 48 of the code of Federal
      Regulations as may be amended from time to time, the parties incorporate
      herein by this reference the regulations and contract clauses required by
      those provisions to be made a part of Government contracts and
      subcontracts.

9. Employment Reports on Special Disabled Veterans and Veterans of the Vietnam
   Era

      (a) The contractor agrees to report at least annually, as required by the
      Secretary of Labor, on:

          (1)  The number of special disabled veterans and the number of
               veterans of the Vietnam era in the workforce of the contractor by
               job category and hiring location; and

          (2)  The total number of new employees hired during the period covered
               by the report, and of that total, the number of veterans of the
               Vietnam era.

      (b) The above items shall be reported by completing the form entitled
      "Federal Contractor Veterans" Employment Report VETS-100."

      (c) Reports shall be submitted no later than March 31 of each year
      beginning March 31, 1988.

      (d) The employment activity report required by paragraph (a)(2) of this
      section shall reflect total hires during the most recent 12-month period
      as of the ending date selected for the employment profile report required
      by paragraph (a)(1) of this section. Contractors may select an ending
      date: (1) as of the end of any pay period during the period January
      through March 1st of the year the report is due, or (2) as of December 31,
      if the contractor has previous written approval form the Equal Employment
      Opportunity Commission to do so for purposes of submitting the Employer
      Information Report EEO-1 (Standard Form 100).

      (e) The count of veterans reported according to paragraph (a) above shall
      be based on voluntary disclosure. Each contractor subject to the reporting
      requirements at 38 U.S.C. 2012(d) shall invite all special disabled
      veterans and veterans of the Vietnam era who wish to benefit under the
      affirmative action program at 38 U.S.C. 2012 to identify themselves to the
      contractor. The invitation shall state that the information is voluntarily
      provided, that the information will be kept confidential, that disclosure
      or refusal to provide the information will not subject the applicant or
      employee to any adverse treatment, and that the information will be used
      only in accordance with the regulations promulgated under 38 U.S.C. 2012.
      Nothing in this paragraph (e) shall relieve a contractor from liability
      for discrimination under 38 U.S.C. 2012.

                                       26
<PAGE>

                                     [LOGO OF BELL ATLANTIC MOBILE APPEARS HERE]

                                                        CONTRACT NO. ###-##-####

                        JOINT CDPD MARKETING AGREEMENT
                                    between
                                VECTORLINK, INC.
                                      and
                             BELL ATLANTIC MOBILE

================================================================================
                                    PRIVATE

The information contained herein is proprietary and should not be disclosed to
unauthorized persons. It is meant solely for use by authorized Bell Atlantic
Mobile employees and persons employed, retained or consulted by them.
<PAGE>

                                AMENDMENT NO, 1

     This AMENDMENT No. 1 (the "Amendment") is made and entered into by and
between Cellco Partnership, a Delaware general partnership, doing business as
Bell Atlantic Mobile (hereinafter "BAM") and VECTORLINK, INC. (hereinafter
"Company") for attachment to the Joint CDPD Marketing Agreement No. ###-##-####
dated June 25, 1999 (the "Agreement").

     1.   This Amendment is an integral part of the Agreement. The terms used
herein which are defined or specified in the Agreement shall have the meanings
set forth in the Agreement. If there are any inconsistencies between the
provisions of this Amendment and the provisions of the Agreement, the provisions
of this Amendment shall control.

     2.   The Name of the Agent in the Preamble and all sections of the
Agreement shall be changed to: @Road, Inc.

     3.    Exhibit A, AUTHORIZED LOCATIONS TO DO BUSINESS shall be amended by
adding the following MSAs and RSAs:

   =========================================================================
    BELL ATLANTIC MOBILE PRIMARY SERVING MARKETS
   -------------------------------------------------------------------------
    Market Name
   =========================================================================
    MSAs Licensed

   -------------------------------------------------------------------------
    New York/New Jersey MSA               Glen Falls, NY MSA
    Philadelphia, PA-NJ MSA               Burlington, VT MSA
    Pittsburgh, PA MSA                    Providence, RI MSA
    Allentown, PA-NJ MSA                  New Haven, CT MSA
    New Brunswick, NJ MSA                 Worcester, MA MSA
    Wilmington, DE-NJ MSA                 Pittsfield, MA MSA
    Long Branch, NJ MSA                   Bridgeport, CT MSA
    Reading, PA MSA                       Charlotte, NC MSA
    Trenton, NJ MSA                       Springfield, MA MSA
    Atlantic City, NJ MSA                 Greenville, SC MSA
    Vineland, NJ MSA                      New Bedford, MA MSA
    Boston, MA MSA                        Columbia, SC MSA
    Manchester, NH MSA                    New London-Norwich, CT MSA
    Poughkeepsie, NY MSA                  Hickory, NJ MSA
    Albany, NY MSA                        Anderson, SC MSA
    Orange, NY MSA                        Hartford, CT MSA

   -------------------------------------------------------------------------
<PAGE>

   =========================================================================
    RSAs Licensed

   -------------------------------------------------------------------------

    Delaware 1 - KENT                        Connecticut 2 - WlNDHAM
    New York 5 - OTSEGO                      North Carolina 1 - CHEROKEE
    New Jersey 1 - HUNTERDON                 North Carolina 2 - YANCEY
    New Jersey 2 - OCEAN                     North Carolina 3 - ASHE
    New Jersey 3 - SUSSEX                    North Carolina 4 - HENDERSON
    Pennsylvania 2 - MCKEAN                  North Carolina 5 - ANSON
    Pennsylvania 6 - LAWRENCE (B2)           Rhode Island 1 - NEWPORT
    Pennsylvania 7 - JEFFERSON               South Carolina 1 - OCONEE
    Pennsylvania 9 - GREENE                  South Carolina 2 - NEWBERRY
    Pennsylvania 11 - HUNTINGDON             South Carolina 3 - CHEROKEE
    Massachusetts 2 - BARNSTABLE             South Carolina 7 - CALHOUN
    New Hampshire 2 - CARROLL                South Carolina 9 - LANCASTER
    Vermont 1 - FRANKLIN                     Virginia 1 - LEE
    Vermont 2 - ADDISON                      Georgia 2 - DAWSON
                                             West Virginia 1 - MASON
                                             West Virginia 2 - WETZEL

   =========================================================================

     4.   This Amendment shall be effective when executed by both parties.

     5.   All provisions of the Agreement, including attachments thereto, not
addressed by this Amendment remain in full force and effect.

     IN WITNESS WHEREOF, and intending to be bound hereby, the parties affix
their signature to this Amendment.

CELLCO PARTNERSHIP
by Bell Atlantic Mobile, Inc.
its managing general partner                 @ROAD, INC

By:    /s/ Gary Schulman                     By:    /s/ Amin Mufti
      -------------------------------              -----------------------------

Name:  Gary Schulman                         Name:   Amin Mufti
      -------------------------------              -----------------------------

Title: Regional President                    Title:  VP Business Development
      -------------------------------              -----------------------------

Date:  10/12/99                              Date:    10/8/1999
      -------------------------------              -----------------------------

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00004-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00004-of-00352.parquet"}]]