<PAGE>
                                                                    EXHIBIT 10.7

SILICON VALLEY BANK
     AMENDMENT TO LOAN DOCUMENTS

BORROWER: WIRELESS, INC.
          5452 BETSY ROSS DRIVE
     SANTA CLARA, CALIFORNIA 95054-1101

DATE:     FEBRUARY 23, 2000


     THIS AMENDMENT TO LOAN DOCUMENTS is entered into between SILICON VALLEY
BANK ("Silicon") and the borrower named above ("Borrower").

     The Parties agree to amend the Loan and Security Agreement between them,
dated February 27, 1999 (as amended, the "Loan Agreement"), as follows,
effective as of the date hereof. (Capitalized terms used but not defined in this
Amendment shall have the meanings set forth in the Loan Agreement.)

     1. AMENDMENT TO SCHEDULE. The Schedule to the Loan Agreement is hereby
deleted and replaced with the Schedule attached hereto.

     2. MODIFICATION TO AUDIT FEE. The sentence in Section 5.4 of the Loan
Agreement that currently reads as follows:

          The foregoing inspections and audits shall be at Borrower's expense
          and the charge therefor shall be $500 per person per day (or such
          higher amount as shall represent Silicon's then current standard
          charge for the same), plus reasonable out of pocket expenses.

is hereby amended to read as follows:

          The foregoing inspections and audits shall be at Borrower's expense
          and the charge therefor shall be $600 per person per day (or such
          higher amount as shall represent Silicon's then current standard
          charge for the same), plus reasonable out of pocket expenses.

     3. MODIFICATION TO EARLY TERMINATION FEE. The sentence in Section 6.2 of
the Loan Agreement that currently reads as follows:

          If this Agreement is terminated by Borrower or by Silicon under this
          Section 6.2, Borrower shall pay to Silicon a termination fee in an
          amount equal to two percent (2.0%) of the Maximum Credit Limit.

is hereby amended to read as follows:

          If this Agreement is terminated by Borrower or by Silicon under this
          Section 6.2, Borrower shall pay to Silicon a termination fee in an
          amount equal to one percent (1.0%) of the Maximum Credit Limit,
          provided that


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          no termination fee shall be charged if the credit facility hereunder
          is replaced with a new facility from another division of Silicon
          Valley Bank or if the Obligations are indefeasibly paid in full from
          the proceeds of Borrower's initial public offering of its equity
          securities.

     4. FEE. Borrower shall pay to Silicon a fee of $20,000 in connection with
this Amendment, and one percent (1.0%) of the amount of increase in the Maximum
Credit Limit, if any, as set forth in the Schedule to Loan and Security
Agreement of even date herewith, which fee(s) are in addition to all other
amounts payable under the Loan Agreement and which are not refundable.

     5. REPRESENTATIONS TRUE. Borrower represents and warrants to Silicon that
all representations and warranties set forth in the Loan Agreement, as amended
hereby, are true and correct.

     6. GENERAL PROVISIONS. This Amendment, the Loan Agreement, any prior
written amendments to the Loan Agreement signed by Silicon and Borrower, and the
other written documents and agreements between Silicon and Borrower set forth in
full all of the representations and agreements of the parties with respect to
the subject matter hereof and supersede all prior and contemporaneous
discussions, representations, agreements and understandings between the
parties with respect to the subject hereof. Except as herein expressly amended,
all of the terms and provisions of the Loan Agreement, and all other documents
and agreements between Silicon and Borrower shall continue in full force and
effect and the same are hereby ratified and confirmed.

BORROWER:                                    SILICON:

WIRELESS, INC.                               SILICON VALLEY BANK

BY  /s/ William E. Gibson                    BY  /s/ Jack Groat
  --------------------------------             --------------------------------
    PRESIDENT OR VICE PRESIDENT              TITLE  SVP
                                                  -----------------------------
BY  /s/ Charles Pai
  --------------------------------
    SECRETARY OR ASS'T SECRETARY


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SILICON VALLEY BANK


                                   SCHEDULE TO

                           LOAN AND SECURITY AGREEMENT

BORROWER: WIRELESS, INC.
ADDRESS:       5452 BETSY ROSS DRIVE
               SANTA CLARA, CALIFORNIA 95054-1101

DATE:     FEBRUARY 23, 2000

This Schedule forms an integral part of the Loan and Security Agreement between
Silicon Valley Bank and the above-borrower dated February 27, 1999 and as
amended from time to time.

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1. CREDIT LIMIT
   (Section 1.1):   An amount not to exceed the lesser of: (i) $2,000,000 at any
                    one time outstanding (the "Maximum Credit Limit"); or (ii)
                    80% of the amount of Borrower's Eligible Receivables (as
                    defined in Section 8 above).

                    Upon Silicon's receipt of evidence, satisfactory to Silicon
                    in its sole discretion, of Borrower's satisfaction of either
                    of the following conditions, the Maximum Credit Limit shall
                    be increased from $2,000,000 to $5,000,000:


                    (i)  Borrower's receipt of at least $10,000,000 in net cash
                         proceeds from (a) the issuance, after the date hereof,
                         of its equity securities (other than an initial public
                         offering) or (b) the issuance, after the date hereof,
                         of subordinated debt (which subordinated debt shall be
                         subordinated to the Obligations in form satisfactory to
                         Silicon in its discretion); or

                    (ii) Borrower's receipt by May 31, 2000 of at least
                         $50,000,000 in net cash proceeds from Borrower's
                         initial public offering of its equity securities.

   LETTER OF CREDIT SUBLIMIT
   (Section 1.5):   $500,000

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2. INTEREST.

    INTEREST RATE
    (Section 1.2):  A rate equal to the "Prime Rate" in effect from time to
                    time, plus 2.50% per annum. Interest shall be calculated on
                    the basis of a 360-day year for the actual number of days
                    elapsed. "Prime Rate" means the rate announced from time to
                    time by Silicon as its "prime rate;" it is a base rate upon
                    which other rates charged by Silicon are based, and it is
                    not necessarily the best rate available at Silicon. The
                    interest rate


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                    applicable to the Obligations shall change on each date
                    there is a change in the Prime Rate.

    MINIMUM MONTHLY
    INTEREST
    (Section 1.2): N/A.

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3. FEES (Section 1.4):

    Loan Fee:       See Amendment to Loan Documents of even date herewith.

    Collateral Monitoring
    Fee:            $1,000 per calendar month, payable in arrears (prorated for
                    any partial calendar month at the beginning and at
                    termination of this Agreement).

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4. MATURITY DATE
   (Section 6.1)    February 23, 2001, subject to early termination as provided
                    in Section 6.2 above.

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5. FINANCIAL COVENANTS
   (Section 5.1):   Borrower shall comply with the following covenant.
                    Compliance shall be determined as of the end of each month.

    MINIMUM TANGIBLE
    NET WORTH:      Commencing with the Borrower's financial statements dated as
                    of February 29, 2000, Borrower shall maintain a Tangible Net
                    Worth of not less than $15,000,000.

    DEFINITIONS.
                    For purposes of the foregoing financial covenant, the
                    following terms shall have the following meanings:

                    "Liabilities" shall have the meaning ascribed thereto by
                    generally accepted accounting principles.

                    "Tangible Net Worth" shall mean the excess of total assets
                    over total liabilities, determined in accordance with
                    generally accepted accounting principles, with the following
                    adjustments:

                        (A) there shall be excluded from assets: (i) notes,
                        accounts receivable and other obligations owing to the
                        Borrower from its officers or other Affiliates, and (ii)
                        all assets which would be classified as intangible
                        assets under generally accepted accounting principles,
                        including without limitation goodwill, licenses,
                        patents, trademarks, trade names, copyrights,
                        capitalized software and organizational costs, licenses
                        and franchises

                        (B) there shall be excluded from liabilities: all
                        indebtedness which is subordinated to the Obligations
                        under a subordination agreement in form specified by
                        Silicon or by language in the instrument evidencing the
                        indebtedness which is acceptable to Silicon in its
                        discretion.


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6. REPORTING.
   (Section 5.3):

                    Borrower shall provide Silicon with the following:

                    1.   Monthly Receivable agings, aged by invoice date, within
                         fifteen days after the end of each month.

                    2.   Monthly accounts payable agings, aged by invoice date,
                         and outstanding or held check registers, if any, within
                         fifteen days after the end of each month.

                    3.   Monthly reconciliations of Receivable agings (aged by
                         invoice date), transaction reports, and general ledger,
                         within fifteen days after the end of each month.

                    4.   Monthly perpetual inventory reports for the Inventory
                         valued on a first-in, first-out basis at the lower of
                         cost or market (in accordance with generally accepted
                         accounting principles) or such other inventory reports
                         as are reasonably requested by Silicon, all within
                         fifteen days after the end of each month.

                    5.   Monthly unaudited financial statements, as soon as
                         available, and in any event within thirty days after
                         the end of each month.

                    6.   Monthly Compliance Certificates, within thirty days
                         after the end of each month, in such form as Silicon
                         shall reasonably specify, signed by the Chief Financial
                         Officer of Borrower, certifying that as of the end of
                         such month Borrower was in full compliance with all of
                         the terms and conditions of this Agreement, and setting
                         forth calculations showing compliance with the
                         financial covenants set forth in this Agreement and
                         such other information as Silicon shall reasonably
                         request, including, without limitation, a statement
                         that at the end of such month there were no held
                         checks.

                    7.   Quarterly unaudited financial statements, as soon as
                         available, and in any event within forty-five days
                         after the end of each fiscal quarter of Borrower.

                    8.   Annual operating budgets (including income statements,
                         balance sheets and cash flow statements, by month) for
                         the upcoming fiscal year of Borrower within thirty days
                         prior to the end of each fiscal year of Borrower.

                    9.   Annual financial statements, as soon as available, and
                         in any event within 120 days following the end of
                         Borrower's fiscal year, certified by independent
                         certified public accountants acceptable to Silicon.

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7. COMPENSATION
   (Section 5.5):       Without Silicon's prior written consent, Borrower shall
                        not pay total compensation, including salaries,
                        withdrawals, fees, bonuses, commissions, drawing
                        accounts and other payments, whether directly or
                        indirectly, in money or otherwise, during any fiscal
                        year to all of Borrower's executives, officers and
                        directors (or any relative thereof) as a group in excess
                        of 115% of the total amount thereof in the prior fiscal
                        year.


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8. BORROWER INFORMATION:

     PRIOR NAMES OF
     BORROWER
     (Section 3.2):             None.

     PRIOR TRADE
     NAMES OF BORROWER
     (Section 3.2):             None.

     EXISTING TRADE
     NAMES OF BORROWER
     (Section 3.2):             None.

     OTHER LOCATIONS AND
     ADDRESSES (Section 3.3):   None.

     MATERIAL ADVERSE
     LITIGATION (Section 3.10): None.

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9. OTHER COVENANTS
   (Section 5.1):       Borrower shall at all times comply with all of the
                        following additional covenants:

                        (1)     BANKING RELATIONSHIP. Borrower shall at all
                                times maintain its primary banking relationship
                                with Silicon.

                        (2)     SUBORDINATION OF INSIDE DEBT. All present and
                                future indebtedness of the Borrower to its
                                officers, directors and shareholders ("Inside
                                Debt") shall, at all times, be subordinated to
                                the Obligations pursuant to a subordination
                                agreement on Silicon's standard form. Borrower
                                represents and warrants that there is no Inside
                                Debt presently outstanding, except for the
                                following: $1,000,000 in favor of AMT Venture
                                Partners, Ltd. Prior to incurring any Inside
                                Debt in the future, Borrower shall cause the
                                person to whom such Inside Debt will be owed to
                                execute and deliver to Silicon a subordination
                                agreement on Silicon's standard form.

                        (3)     OCTOBER 1998 WARRANTS. Pursuant to the terms set
                                forth in that certain Warrant to Purchase Stock
                                (the "October 1998 Warrant") and related
                                documents executed October 16, 1998, Borrower
                                has provided Silicon with five-year warrants, to
                                purchase 48,000 shares of Series D preferred
                                stock of the Borrower, at $1.25 per share (which
                                Borrower represents and warrants is the last
                                price at which Borrower issued and sold its
                                Series D preferred stock). Borrower agrees to
                                cause the October 1998 Warrant and all related
                                documents to continue in full force and effect
                                for so long as this Agreement remains in effect.

                        (4)     SEPTEMBER 1999 WARRANTS. Pursuant to the terms
                                set forth in that certain Warrant to Purchase
                                Stock (the "September 1999 Warrant") and related
                                documents executed September 13, 1999, Borrower
                                has provided Silicon with five-year warrants, to


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                                purchase 20,000 shares of Series E preferred
                                stock of the Borrower, at $2.50 per share.
                                Borrower agrees to cause the September 1999
                                Warrant and all related documents to continue in
                                full force and effect for so long as this
                                Agreement remains in effect.

                        (5)     INVESTOR COMMON STOCK WARRANT. Pursuant to the
                                terms of that certain Waiver and Amendment
                                Agreement dated October 8, 1999 (the "October
                                Amendment"), upon the conversion by the holder
                                of the Bank Series E Warrant (as defined in the
                                October Amendment), Borrower shall issue
                                Silicon a New Warrant (as defined in the October
                                Amendment). Borrower agrees to cause the October
                                Amendment to continue in full force and effect
                                for so long as this Agreement remains in effect.

                        (6)     ADDITIONAL WARRANTS. If Borrower's initial
                                public offering of its equity securities is not
                                completed by May 31, 2000, or such initial
                                public offering fails to result in the
                                Borrower's receipt of at least $50,000,000 in
                                net cash proceeds therefrom, Borrower shall
                                immediately provide Silicon with five-year
                                warrants (the "Warrants") to purchase 37,500
                                shares of common stock of Borrower, on the terms
                                set forth in Silicon's standard form of Warrant
                                to Purchase Stock and related documents, at a
                                price per share equal to $4.00 per share. In
                                addition, concurrently therewith, Borrower and
                                Silicon shall enter into an Anti-Dilution
                                Agreement and Registration Rights Agreement on
                                Silicon's standard forms. The aforementioned
                                warrants shall consist of the terms and
                                provisions of Silicon's standard form Warrant to
                                Purchase Stock and related documents, with such
                                changes therein as Silicon may agree to.



Borrower:                                    Silicon:
 WIRELESS, INC.                              SILICON VALLEY BANK

By                                           By  /s/ Jack Groat
  ---------------------------------            ---------------------------------
     President or Vice President             Title   SVP
                                                  ------------------------------

By  /s/ Charles Pai
  ---------------------------------
     Secretary or Ass't Secretary


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