<PAGE>
                                                                     Exhibit 4.3

                                 FORM OF WARRANT

THE SECURITIES REPRESENTED BY THIS WARRANT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED, OR APPLICABLE STATE SECURITIES LAWS. THE
SECURITIES HAVE BEEN ACQUIRED FOR INVESTMENT AND MAY NOT BE OFFERED FOR SALE,
SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION
STATEMENT FOR THE SECURITIES UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR
APPLICABLE STATE SECURITIES LAWS, OR AN OPINION OF COUNSEL IN A FORM REASONABLY
SATISFACTORY TO THE ISSUER THAT REGISTRATION IS NOT REQUIRED UNDER SAID ACT OR
APPLICABLE STATE SECURITIES LAWS OR UNLESS SOLD PURSUANT TO RULE 144 UNDER SAID
ACT. NOTWITHSTANDING THE FOREGOING, THIS WARRANT MAY BE PLEDGED IN CONNECTION
WITH A BONA FIDE MARGIN ACCOUNT.

                              LOG ON AMERICA, INC.

                        WARRANT TO PURCHASE COMMON STOCK

Warrant No.:                                          Number of Shares:
             -----------------------                                    --------
Date of Issuance: _____________ __, _____


Log On America, Inc., a Delaware corporation (the "Company"), hereby certifies
that, for Ten United States Dollars ($10.00) and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
____________________, the registered holder hereof or its permitted assigns, is
entitled, subject to the terms set forth below, to purchase from the Company
upon surrender of this Warrant, at any time or times on or after the date
hereof, but not after 11:59 P.M. Eastern Time on the Expiration Date (as defined
herein) ___________________ (________) [INSERT for (I) Initial Closing - Pro
Rata amount of 594,204 based on the number of Initial Preferred Shares purchased
compared to the number of Initial Preferred Shares issued and (II) for all other
Closings $1,000 / Closing Price (as defined in the Certificate of Designations)
of the Common Stock for the applicable Preferred Shares*0.65] fully paid
nonassessable shares of Common Stock (as defined herein) of the Company (the
"Warrant Shares") at the purchase price per share provided in Section 1(b)
below; provided, however, that in no event shall the holder be entitled to
exercise this Warrant for a number of Warrant Shares in excess of that number of
Warrant Shares which, upon giving effect to such exercise, would cause the
aggregate number of shares of Common Stock beneficially owned by the holder and
its affiliates to exceed 4.99% of the outstanding shares of the Common Stock
following such exercise. For purposes of the foregoing proviso, the aggregate
number of shares of Common Stock beneficially owned by the holder and its
affiliates shall include the number of shares of Common Stock issuable upon
exercise of this Warrant with respect to which


                                      -1-
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the determination of such proviso is being made, but shall exclude shares of
Common Stock which would be issuable upon (i) exercise of the remaining,
unexercised Warrants beneficially owned by the holder and its affiliates and
(ii) exercise or conversion of the unexercised or unconverted portion of any
other securities of the Company beneficially owned by the holder and its
affiliates (including, without limitation, any convertible notes or preferred
stock) subject to a limitation on conversion or exercise analogous to the
limitation contained herein. Except as set forth in the preceding sentence, for
purposes of this paragraph, beneficial ownership shall be calculated in
accordance with Section 13(d) of the Securities Exchange Act of 1934, as
amended. For purposes of this Warrant, in determining the number of outstanding
shares of Common Stock a holder may rely on the number of outstanding shares of
Common Stock as reflected in (1) the Company's most recent Form 10-Q or Form
10-K, as the case may be, (2) a more recent public announcement by the Company
or (3) any other notice by the Company or its transfer agent setting forth the
number of shares of Common Stock outstanding. Upon the written request of any
holder, the Company shall promptly, but in no event later than one (1) Business
Day following the receipt of such notice, confirm in writing to any such holder
the number of shares of Common Stock then outstanding. In any case, the number
of outstanding shares of Common Stock shall be determined after giving effect to
conversions of Preferred Shares and exercise of Warrants (as defined below) by
such holder and its affiliates since the date as of which such number of
outstanding shares of Common Stock was reported.

         Section 1.

                  (a) Securities Purchase Agreement. This Warrant is one of the
Warrants (the "Preferred Share Warrants") issued pursuant to Section 1 of that
certain Securities Purchase Agreement dated as of February 23, 2000, among the
Company and the Buyers referred to therein (the "Securities Purchase
Agreement").

                  (b) Definitions. The following words and terms as used in this
Warrant shall have the following meanings:

                      (i) "Approved Stock Plan" shall mean any employee benefit
plan which has been approved by the Board of Directors of the Company, pursuant
to which the Company's securities may be issued to any employee, officer or
director for services provided to the Company.

                      (ii) "Business Day" means any day other than Saturday,
Sunday or other day on which commercial banks in the City of New York are
authorized or required by law to remain closed.

                      (iii) "Certificate of Designations" means the Company's
Certificate of Designations, Preferences and Rights of the Company's Series A
Convertible Preferred Stock.

                      (iv) "Common Stock" means (i) the Company's common stock,
par value $0.01 per share, and (ii) any capital stock into which such Common
Stock shall have been changed or any capital stock resulting from a
reclassification of such Common Stock.

                      (v) "Convertible Securities" means any stock or securities
(other than Options) directly or indirectly convertible into or exchangeable for
Common Stock.


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                      (vi) "Excluded Securities" means, provided such security
is issued at a price which is greater than or equal to the arithmetic average of
the Closing Bid Prices (as defined in the Certificate of Designations) of the
Common Stock for the ten (10) consecutive trading days immediately preceding the
date of issuance, any of the following (a) any issuance by the Company of
securities in connection with a strategic partnership or a joint venture (the
primary purpose of which is not to raise equity capital), (b) any issuance by
the Company of securities as consideration for a merger or consolidation or the
acquisition of a business, product, license, or other assets of another person
or entity and (c) options to purchase shares of Common Stock, provided (I) such
options are issued after the date of this Warrant to employees of the Company
within 30 days of such employee starting their employment with the Company, (II)
an aggregate of no more than 1,000,000 options are issued in reliance on this
exclusion and (III) the exercise price of such options is not less than 75% of
the market price of the Common Stock on the date of issuance of such options.

                      (vii) "Expiration Date" means the date five (5) years from
the Issuance Date of this Warrant or, if such date falls on a Saturday, Sunday
or other day on which banks are required or authorized to be closed in the City
of New York or the State of New York or on which trading does not take place on
the principal exchange or automated quotation system on which the Common Stock
is traded (a "Holiday"), the next date that is not a Holiday.

                      (viii) "Issuance Date" means, with respect to each
Warrant, the date of issuance of the applicable Warrant.

                      (ix) "Issuance Price" means, with respect to any security,
the lesser of (A) the Market Price on the Issuance Date of this Warrant and (B)
$24.13 (as adjusted for stock splits, stock dividends or similar transactions).

                      (x) "Market Price" means, with respect to any security for
any date of determination, that price which shall be computed as the arithmetic
average of the Weighted Average Price for such security on each of the 5
consecutive trading days immediately preceding such date of determination (all
such determinations to be appropriately adjusted for any stock dividend, stock
split or similar transaction during the pricing period).

                      (xi) "Options" means any rights, warrants or options to
subscribe for or purchase Common Stock or Convertible Securities.

                      (xii) "Other Securities" means (i) those options and
warrants of the Company issued prior to, and outstanding on, the date of
issuance of this Warrant, (ii) the shares of Common Stock issued upon exercise
of such options and warrants, provided such options and warrants are not amended
after the issuance date of this Warrant, (iii) the Preferred Shares and (iv) the
shares of Common Stock issued upon conversion of the Preferred Shares or
exercise of the Preferred Share Warrants.


                                      -3-
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                      (xiii) "Person" means an individual, a limited liability
company, a partnership, a joint venture, a corporation, a trust, an
unincorporated organization and a government or any department or agency
thereof.

                      (xiv) "Preferred Shares" means the shares of the Company's
Series A Convertible Preferred Shares issued pursuant to the Securities Purchase
Agreement.

                      (xv) "Principal Market" means the Nasdaq National Market
or if the Common Stock is not traded on the Nasdaq Market, then the principal
securities exchange or trading market for the Common Stock.

                      (xvi) "Registration Rights Agreement" means that Agreement
dated February 23, 2000 by and among the Company and the Buyers referred to
therein.

                      (xvii) "Securities Act" means the Securities Act of 1933,
as amended.

                      (xviii) "Warrant" means this Warrant and all Warrants
issued in exchange, transfer or replacement thereof.

                      (xix) "Warrant Exercise Price" means, with respect to any
Warrant Share, [Initial Closing - $17.23 // all other Closings - 105% of the
Issuance Price of the Common Stock], subject to adjustment as hereinafter
provided.

                      (xx) "Weighted Average Price" means, for any security as
of any date, the dollar volume-weighted average price for such security on the
Principal Market (as reported by Bloomberg Financial Markets ("Bloomberg")
through its "Volume at Price" function) or, if the foregoing does not apply, the
dollar volume-weighted average price of such security in the over-the-counter
market on the electronic bulletin board for such security as reported by
Bloomberg, or, if no dollar volume-weighted average price is reported for such
security by Bloomberg, the average of the bid prices of each of the market
makers for such security as reported in the "pink sheets" by the National
Quotation Bureau, Inc. If the Weighted Average Price cannot be calculated for
such security on such date on any of the foregoing bases, the Weighted Average
Price of such security on such date shall be the fair market value as mutually
determined by the Company and the holders of the Preferred Shares. If the
Company and the holders of the Preferred Shares are unable to agree upon the
fair market value of the Common Stock, then such dispute shall be resolved
pursuant to Section 2(a) below with the term "Weighted Average Price" being
substituted for the term "Market Price." All such determinations to be
appropriately adjusted for any stock dividend, stock split or other similar
transaction during such period.

                  (c) Other Definitional Provisions.

                      (i) Except as otherwise specified herein, all references
herein (A) to the Company shall be deemed to include the Company's successors
and (B) to any applicable law


                                      -4-
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defined or referred to herein, shall be deemed references to such applicable law
as the same may have been or may be amended or supplemented from time to time.

                      (ii) When used in this Warrant, the words "herein,"
"hereof," and "hereunder," and words of similar import, shall refer to this
Warrant as a whole and not to any provision of this Warrant, and the words
"Section," "Schedule," and "Exhibit" shall refer to Sections of, and Schedules
and Exhibits to, this Warrant unless otherwise specified.

                      (iii) Whenever the context so requires, the neuter gender
includes the masculine or feminine, and the singular number includes the plural,
and vice versa.

         Section 2. Exercise of Warrant.

                  (a) Subject to the terms and conditions hereof, this Warrant
may be exercised by the holder hereof then registered on the books of the
Company, in whole or in part, at any time on any Business Day on or after the
opening of business on the date hereof and prior to 11:59 P.M. Eastern Time on
the Expiration Date by (i) delivery of a written notice, in the form of the
subscription notice attached as Exhibit A hereto (the "Exercise Notice"), of
such holder's election to exercise this Warrant, which notice shall specify the
number of Warrant Shares to be purchased, (ii) (A) payment to the Company of an
amount equal to the applicable Warrant Exercise Price multiplied by the number
of Warrant Shares as to which this Warrant is being exercised (the "Aggregate
Exercise Price") in cash or wire transfer of immediately available funds or (B)
by notifying the Company that this Warrant is being exercised pursuant to a
Cashless Exercise (as defined in Section 2(f)) and (iii) the surrender to a
common carrier for overnight delivery to the Company as soon as practicable
following such date, this Warrant (or an indemnification undertaking with
respect to this Warrant in the case of its loss, theft or destruction). In the
event of any exercise of the rights represented by this Warrant in compliance
with this Section 2(a), the Company shall on the second Business Day following
the date of receipt of the Exercise Notice, the Aggregate Exercise Price (or
notice of a Cashless Exercise) and this Warrant (or an indemnification
undertaking with respect to this Warrant in the case of its loss, theft or
destruction) (the "Exercise Delivery Documents"), credit such aggregate number
of shares of Common Stock to which the holder shall be entitled to the holder's
or its designee's balance account with The Depository Trust Company; provided,
however, if the holder who submitted the Exercise Notice requested physical
delivery of any or all of the Warrant Shares, then the Company shall, on or
before the second Business Day following receipt of the Exercise Delivery
Documents issue and surrender to a common carrier for overnight delivery to the
address specified in the Exercise Notice, a certificate, registered in the name
of the holder, for the number of shares of Common Stock to which the holder
shall be entitled pursuant to such request. Upon delivery of the Exercise Notice
and Aggregate Exercise Price referred to in clause (ii)(A) above or notification
to the Company of a Cashless Exercise referred to in Section 2(e), the holder of
this Warrant shall be deemed for all corporate purposes to have become the
holder of record of the Warrant Shares with respect to which this Warrant has
been exercised, irrespective of the date of delivery of this Warrant as required
by clause (iii) above or the certificates evidencing such Warrant Shares. In the
case of a dispute as to the determination of the Warrant Exercise Price or the
Market Price of a security or the arithmetic


                                      -5-
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calculation of the Warrant Shares, the Company shall promptly issue to the
holder the number of shares of Common Stock that is not disputed and shall
submit the disputed determinations or arithmetic calculations to the holder via
facsimile within one (1) Business Day of receipt of the holder's subscription
notice. If the holder and the Company are unable to agree upon the determination
of the Warrant Exercise Price or the Market Price or arithmetic calculation of
the Warrant Shares within one day of such disputed determination or arithmetic
calculation being submitted to the holder, then the Company shall immediately
submit via facsimile (i) the disputed determination of the Warrant Exercise
Price or the Market Price to an independent, reputable investment banking firm
or (ii) the disputed arithmetic calculation of the Warrant Shares to its
independent, outside accountant. The Company shall cause the investment banking
firm or the accountant, as the case may be, to perform the determinations or
calculations and notify the Company and the holder of the results no later than
forty-eight (48) hours from the time it receives the disputed determinations or
calculations. Such investment banking firm's or accountant's determination or
calculation, as the case may be, shall be deemed conclusive absent manifest
error.

                  (b) Unless the rights represented by this Warrant shall have
expired or shall have been fully exercised, the Company shall, as soon as
practicable and in no event later than five (5) Business Days after any exercise
and at its own expense, issue a new Warrant identical in all respects to this
Warrant exercised except it shall represent rights to purchase the number of
Warrant Shares purchasable immediately prior to such exercise under this Warrant
exercised, less the number of Warrant Shares with respect to which such Warrant
is exercised.

                  (c) No fractional shares of Common Stock are to be issued upon
the exercise of this Warrant, but rather the number of shares of Common Stock
issued upon exercise of this Warrant shall be rounded up or down to the nearest
whole number.

                      (d) If the Company shall fail for any reason or for no
reason to issue to the holder within three (3) Business Days of receipt of the
Exercise Delivery Documents, a certificate for the number of shares of Common
Stock to which the holder is entitled or to credit the holder's balance account
with The Depository Trust Company for such number of shares of Common Stock to
which the holder is entitled upon the holder's exercise of this Warrant, the
Company shall, in addition to any other remedies under this Warrant or the
Securities Purchase Agreement or otherwise available to such holder, including
any indemnification under Section 8 of the Securities Purchase Agreement, for
each occurrence of such failure, return to such holder a portion of the
Aggregate Exercise Price paid by the holder in connection with such exercise, on
each day during the period beginning on and including the fourth (4th) Business
Day following the Company's receipt of the Exercise Delivery Documents and
ending on the date such failure is cured, equal to the product of (A) the
Aggregate Exercise Price paid in connection with such exercise in effect
immediately preceding such date and (B) 0.005. In no event shall the amounts
returned to the holder pursuant to the preceding sentence exceed the Aggregate
Exercise Price paid by the holder in connection with the exercise for which such
amounts are being returned.

                  (e) If within five (5) Business Days after the Company's
receipt of the Exercise Delivery Documents, the Company fails to deliver a new
Warrant to the holder for the number of


                                      -6-
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shares of Common Stock to which such holder is entitled pursuant to Section 2(b)
hereof, then, in addition to any other available remedies under this Warrant or
the Securities Purchase Agreement including indemnification pursuant to Section
8 thereof or otherwise available to such holder, the Company shall for each
occurrence of such failure reduce the Warrant Exercise Price then in effect for
the Warrant Shares underlying such undelivered Warrant, on each day during the
period beginning on the sixth (6th) Business Day following the Company's receipt
of the Exercise Delivery Documents and ending on the date such failure is cured,
by an amount equal to the product of (A) the Warrant Exercise Price in effect
immediately proceeding such date and (B) 0.005.

                  (f) If, despite the Company's obligations under the Securities
Purchase Agreement and the Registration Rights Agreement, the Warrant Shares to
be issued are not registered and available for resale pursuant to a registration
statement (including during an Allowable Grace Period (as defined in the
Registration Rights Agreement)) in accordance with the Registration Rights
Agreement, then notwithstanding anything contained herein to the contrary, the
holder of this Warrant may, at its election exercised in its sole discretion,
exercise this Warrant in whole or in part and, in lieu of making the cash
payment otherwise contemplated to be made to the Company upon such exercise in
payment of the Aggregate Exercise Price, elect instead to receive upon such
exercise the "Net Number" of shares of Common Stock determined according to the
following formula (a "Cashless Exercise"):

         Net Number = (A x B) - (A x C)
                      -----------------
                              B
                  For purposes of the foregoing formula:

                           A= the total number of shares with respect to which
                           this Warrant is then being exercised.

                           B= the Closing Sale Price (as reported in
                           Bloomberg) of the Common Stock on the date
                           immediately preceding the date of the subscription
                           notice.
                           C= the Warrant Exercise Price then in effect for the
                           applicable Warrant Shares at the time of such
                           exercise.

         Section 3. Covenants as to Common Stock. The Company hereby covenants
and agrees as follows:

                  (a) This Warrant is, and any Warrants issued in substitution
for or replacement of this Warrant will upon issuance be, duly authorized and
validly issued.

                  (b) All Warrant Shares which may be issued upon the exercise
of the rights represented by this Warrant will, upon issuance, be validly
issued, fully paid and nonassessable and free from all taxes, liens and charges
with respect to the issue thereof.


                                      -7-
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                  (c) During the period within which the rights represented by
this Warrant may be exercised, the Company will at all times have authorized and
reserved at least 100% of the number of shares of Common Stock needed to provide
for the exercise of the rights then represented by this Warrant and the par
value of said shares will at all times be less than or equal to the applicable
Warrant Exercise Price.

                  (d) The Company shall promptly secure the listing of the
shares of Common Stock issuable upon exercise of this Warrant upon each national
securities exchange or automated quotation system, if any, upon which shares of
Common Stock are then listed (subject to official notice of issuance upon
exercise of this Warrant) and shall maintain, so long as any other shares of
Common Stock shall be so listed, such listing of all shares of Common Stock from
time to time issuable upon the exercise of this Warrant; and the Company shall
so list on each national securities exchange or automated quotation system, as
the case may be, and shall maintain such listing of, any other shares of capital
stock of the Company issuable upon the exercise of this Warrant if and so long
as any shares of the same class shall be listed on such national securities
exchange or automated quotation system.

                      (e) The Company will not, by amendment of its Certificate
of Incorporation or through any reorganization, transfer of assets,
consolidation, merger, dissolution, issue or sale of securities, or any other
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms to be observed or performed by it hereunder, but will at all times in
good faith assist in the carrying out of all the provisions of this Warrant and
in the taking of all such action as may reasonably be requested by the holder of
this Warrant in order to protect the exercise privilege of the holder of this
Warrant against dilution or other impairment, consistent with the tenor and
purpose of this Warrant. No impairment of the designations, preferences and
rights of the Preferred Shares contained in the Company's Certificate of
Designations or any waiver thereof which has an adverse effect on the rights
granted hereunder shall be given effect until the Company has taken appropriate
action (satisfactory to the holders of Preferred Share Warrants representing a
majority of the shares of Common Stock issuable upon the exercise of such
Preferred Share Warrants then outstanding) to avoid such adverse effect with
respect to this Warrant. Without limiting the generality of the foregoing, the
Company (i) will not increase the par value of any shares of Common Stock
receivable upon the exercise of this Warrant above the Warrant Exercise Price
then in effect, and (ii) will take all such actions as may be necessary or
appropriate in order that the Company may validly and legally issue fully paid
and nonassessable shares of Common Stock upon the exercise of this Warrant.

                  (f) This Warrant will be binding upon any entity succeeding to
the Company by merger, consolidation or acquisition of all or substantially all
of the Company's assets.

         Section 4. Taxes. The Company shall pay any and all taxes which may be
payable with respect to the issuance and delivery of Warrant Shares upon
exercise of this Warrant.

         Section 5. Warrant Holder Not Deemed a Stockholder. Except as otherwise
specifically provided herein, no holder, as such, of this Warrant shall be
entitled to vote or receive dividends or

                                      -8-
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be deemed the holder of shares of the Company for any purpose, nor shall
anything contained in this Warrant be construed to confer upon the holder
hereof, as such, any of the rights of a stockholder of the Company or any right
to vote, give or withhold consent to any corporate action (whether any
reorganization, issue of stock, reclassification of stock, consolidation,
merger, conveyance or otherwise), receive notice of meetings, receive dividends
or subscription rights, or otherwise, prior to the issuance to the holder of
this Warrant of the Warrant Shares which he or she is then entitled to receive
upon the due exercise of this Warrant. In addition, nothing contained in this
Warrant shall be construed as imposing any liabilities on such holder to
purchase any securities (upon exercise of this Warrant or otherwise) or as a
stockholder of the Company, whether such liabilities are asserted by the Company
or by creditors of the Company. Notwithstanding this Section 5, the Company will
provide the holder of this Warrant with copies of the same notices and other
information given to the stockholders of the Company generally,
contemporaneously with the giving thereof to the stockholders.

         Section 6. Representations of Holder. The holder of this Warrant, by
the acceptance hereof, represents that it is acquiring this Warrant and the
Warrant Shares for its own account for investment only and not with a view
towards, or for resale in connection with, the public sale or distribution of
this Warrant or the Warrant Shares, except pursuant to sales registered or
exempted under the Securities Act; provided, however, that by making the
representations herein, the holder does not agree to hold this Warrant or any of
the Warrant Shares for any minimum or other specific term and reserves the right
to dispose of this Warrant and the Warrant Shares at any time in accordance with
or pursuant to a registration statement or an exemption under the Securities
Act. The holder of this Warrant further represents, by acceptance hereof, that,
as of this date, such holder is an "accredited investor" as such term is defined
in Rule 501(a)(1) of Regulation D promulgated by the Securities and Exchange
Commission under the Securities Act (an "Accredited Investor"). Upon exercise of
this Warrant, other than pursuant to a Cashless Exercise the holder shall, if
requested by the Company, confirm in writing, in a form satisfactory to the
Company, that the Warrant Shares so purchased are being acquired solely for the
holder's own account and not as a nominee for any other party, for investment,
and not with a view toward distribution or resale and that such holder is an
Accredited Investor. If such holder cannot make such representations because
they would be factually incorrect, it shall be a condition to such holder's
exercise of this Warrant, other than pursuant to a Cashless Exercise, that the
Company receive such other representations as the Company considers reasonably
necessary to assure the Company that the issuance of its securities upon
exercise of this Warrant shall not violate any United States or state securities
laws.

         Section 7.        Ownership and Transfer.

                  (a) The Company shall maintain at its principal executive
offices (or such other office or agency of the Company as it may designate by
notice to the holder hereof), a register for this Warrant, in which the Company
shall record the name and address of the person in whose name this Warrant has
been issued, as well as the name and address of each transferee. The Company may
treat the person in whose name any Warrant is registered on the register as the
owner and holder thereof for all purposes, notwithstanding any notice to the
contrary, but in all events recognizing any transfers made in accordance with
the terms of this Warrant.


                                      -9-
<PAGE>

                  (b) This Warrant and the rights granted hereunder shall be
assignable by the holder hereof without the consent of the Company.

                  (c) The Company is obligated to register the Warrant Shares
for resale under the Securities Act pursuant to the Registration Rights
Agreement and the initial holder of this Warrant (and certain assignees thereof)
is entitled to the registration rights in respect of the Warrant Shares as set
forth in the Registration Rights Agreement.

         Section 8. Adjustment of Warrant Exercise Price and Number of Shares.
The Warrant Exercise Price and the number of shares of Common Stock issuable
upon exercise of this Warrant shall be adjusted from time to time as follows:

                  (a) Adjustment of Warrant Exercise Price and Number of Shares
upon Issuance of Common Stock. If and whenever on or after the date of issuance
of this Warrant, the Company issues or sells, or is deemed to have issued or
sold, any shares of Common Stock (other than (i) Excluded Securities and (ii)
shares of Common Stock which are issued or deemed to have been issued by the
Company in connection with an Approved Stock Plan or upon exercise or conversion
of the Other Securities) for a consideration per share less than a price (the
"Applicable Price") equal to the Warrant Exercise Price in effect immediately
prior to such issuance or sale, then immediately after such issue or sale the
Warrant Exercise Price then in effect shall be reduced to an amount equal to
such consideration per share. Upon each such adjustment of the Warrant Exercise
Price hereunder, the number of shares of Common Stock acquirable upon exercise
of this Warrant shall be adjusted to the number of shares determined by
multiplying the Warrant Exercise Price in effect immediately prior to such
adjustment by the number of shares of Common Stock acquirable upon exercise of
this Warrant immediately prior to such adjustment and dividing the product
thereof by the Warrant Exercise Price resulting from such adjustment.

                  (b) Effect on Warrant Exercise Price of Certain Events. For
purposes of determining the adjusted Warrant Exercise Price under Section 8(a)
above, the following shall be applicable:

                      (i) Issuance of Options. If the Company in any manner
grants any Options and the lowest price per share for which one share of Common
Stock is issuable upon the exercise of any such Option or upon conversion or
exchange of any Convertible Securities issuable upon exercise of any such Option
is less than the Applicable Price, then such share of Common Stock shall be
deemed to be outstanding and to have been issued and sold by the Company at the
time of the granting or sale of such Option for such price per share. For
purposes of this Section 8(b)(i), the "lowest price per share for which one
share of Common Stock is issuable upon exercise of such Options or upon
conversion or exchange of such Convertible Securities" shall be equal to the sum
of the lowest amounts of consideration (if any) received or receivable by the
Company with respect to any one share of Common Stock upon the granting or sale
of the Option, upon exercise of the Option and upon conversion or exchange of
any Convertible Security issuable upon exercise of such Option. No further
adjustment of the Warrant Exercise Price shall be made upon the actual issuance
of such Common Stock or of such Convertible Securities upon the exercise of such
Options


                                      -10-
<PAGE>

or upon the actual issuance of such Common Stock upon conversion or exchange of
such Convertible Securities.

                      (ii) Issuance of Convertible Securities. If the Company in
any manner issues or sells any Convertible Securities and the lowest price per
share for which one share of Common Stock is issuable upon the conversion or
exchange thereof is less than the Applicable Price, then such share of Common
Stock shall be deemed to be outstanding and to have been issued and sold by the
Company at the time of the issuance or sale of such Convertible Securities for
such price per share. For the purposes of this Section 8(b)(ii), the "lowest
price per share for which one share of Common Stock is issuable upon such
conversion or exchange" shall be equal to the sum of the lowest amounts of
consideration (if any) received or receivable by the Company with respect to one
share of Common Stock upon the issuance or sale of the Convertible Security and
upon conversion or exchange of such Convertible Security. No further adjustment
of the Warrant Exercise Price shall be made upon the actual issuance of such
Common Stock upon conversion or exchange of such Convertible Securities, and if
any such issue or sale of such Convertible Securities is made upon exercise of
any Options for which adjustment of the Warrant Exercise Price had been or are
to be made pursuant to other provisions of this Section 8(b), no further
adjustment of the Warrant Exercise Price shall be made by reason of such issue
or sale.

                      (iii) Change in Option Price or Rate of Conversion. If the
purchase or exercise price provided for in any Options, the additional
consideration, if any, payable upon the issue, conversion or exchange of any
Convertible Securities, or the rate at which any Convertible Securities are
convertible into or exchangeable for Common Stock changes at any time, the
Warrant Exercise Price in effect at the time of such change shall be adjusted to
the Warrant Exercise Price which would have been in effect at such time had such
Options or Convertible Securities provided for such changed purchase price,
additional consideration or changed conversion rate, as the case may be, at the
time initially granted, issued or sold and the number of shares of Common Stock
acquirable hereunder shall be correspondingly readjusted. For purposes of this
Section 8(b)(iii), if the terms of any Option or Convertible Security that was
outstanding as of the date of issuance of this Warrant are changed in the manner
described in the immediately preceding sentence, then such Option or Convertible
Security and the Common Stock deemed issuable upon exercise, conversion or
exchange thereof shall be deemed to have been issued as of the date of such
change. No adjustment pursuant to this Section 8(b) shall be made if such
adjustment would result in an increase of the Warrant Exercise Price then in
effect.

                  (c) Effect on Warrant Exercise Price of Certain Events. For
purposes of determining the adjusted Warrant Exercise Price under Sections 8(a)
and 8(b), the following shall be applicable:

                      (i) Calculation of Consideration Received. If any Common
Stock, Options or Convertible Securities are issued or sold or deemed to have
been issued or sold for cash, the consideration received therefor will be deemed
to be the net amount received by the Company therefor. If any Common Stock,
Options or Convertible Securities are issued or sold for a consideration other
than cash, the amount of such consideration received by the Company will be the
fair value of such consideration, except where such consideration consists of
marketable securities, in which case the amount of consideration received by the
Company will be


                                      -11-
<PAGE>

the Market Price of such securities on the date of receipt of such securities.
If any Common Stock, Options or Convertible Securities are issued to the owners
of the non-surviving entity in connection with any merger in which the Company
is the surviving entity, the amount of consideration therefor will be deemed to
be the fair value of such portion of the net assets and business of the
non-surviving entity as is attributable to such Common Stock, Options or
Convertible Securities, as the case may be. The fair value of any consideration
other than cash or securities will be determined jointly by the Company and the
holders of Preferred Share Warrants representing at least two-thirds (2/3) of
the shares of Common Stock obtainable upon exercise of the Preferred Share
Warrants then outstanding. If such parties are unable to reach agreement within
ten (10) days after the occurrence of an event requiring valuation (the
"Valuation Event"), the fair value of such consideration will be determined
within five Business Days after the tenth (10th) day following the Valuation
Event by an independent, reputable appraiser jointly selected by the Company and
the holders of Preferred Share Warrants representing at least two-thirds (2/3)
of the shares of Common Stock obtainable upon exercise of the Preferred Share
Warrants then outstanding. The determination of such appraiser shall be final
and binding upon all parties and the fees and expenses of such appraiser shall
be borne jointly by the Company and the holders of Preferred Share Warrants.

                      (ii) Integrated Transactions. In case any Option is issued
in connection with the issue or sale of other securities of the Company,
together comprising one integrated transaction in which no specific
consideration is allocated to such Options by the parties thereto, the Options
will be deemed to have been issued for a consideration of $.01.

                      (iii) Treasury Shares. The number of shares of Common
Stock outstanding at any given time does not include shares owned or held by or
for the account of the Company, and the disposition of any shares so owned or
held will be considered an issue or sale of Common Stock.

                      (iv) Record Date. If the Company takes a record of the
holders of Common Stock for the purpose of entitling them (1) to receive a
dividend or other distribution payable in Common Stock, Options or in
Convertible Securities or (2) to subscribe for or purchase Common Stock, Options
or Convertible Securities, then such record date will be deemed to be the date
of the issue or sale of the shares of Common Stock deemed to have been issued or
sold upon the declaration of such dividend or the making of such other
distribution or the date of the granting of such right of subscription or
purchase, as the case may be.

                  (d) Adjustment of Warrant Exercise Price upon Subdivision or
Combination of Common Stock. If the Company at any time after the date of
issuance of this Warrant subdivides (by any stock split, stock dividend,
recapitalization or otherwise) one or more classes of its outstanding shares of
Common Stock into a greater number of shares, any Warrant Exercise Price in
effect immediately prior to such subdivision will be proportionately reduced and
the number of shares of Common Stock obtainable upon exercise of this Warrant
will be proportionately increased. If the Company at any time after the date of
issuance of this Warrant combines (by combination, reverse stock split or
otherwise) one or more classes of its outstanding shares of Common Stock into


                                      -12-
<PAGE>

a smaller number of shares, any Warrant Exercise Price in effect immediately
prior to such combination will be proportionately increased and the number of
shares of Common Stock obtainable upon exercise of this Warrant will be
proportionately decreased. Any adjustment under this Section 8(d) shall become
effective at the close of business on the date the subdivision or combination
becomes effective.

                  (e) Distribution of Assets. If the Company shall declare or
make any dividend or other distribution of its assets (or rights to acquire its
assets) to holders of Common Stock, by way of return of capital or otherwise
(including, without limitation, any distribution of cash, stock or other
securities, property or options by way of a dividend, spin off,
reclassification, corporate rearrangement or other similar transaction) (a
"Distribution"), at any time after the issuance of this Warrant, then, in each
such case:

                      (i) any Warrant Exercise Price in effect immediately prior
to the close of business on the record date fixed for the determination of
holders of Common Stock entitled to receive the Distribution shall be reduced,
effective as of the close of business on such record date, to a price determined
by multiplying such Warrant Exercise Price by a fraction of which (A) the
numerator shall be the Closing Sale Price of the Common Stock on the trading day
immediately preceding such record date minus the value of the Distribution (as
determined in good faith by the Company's Board of Directors) applicable to one
share of Common Stock, and (B) the denominator shall be the Closing Sale Price
of the Common Stock on the trading day immediately preceding such record date;
and

                      (ii) either (A) the number of Warrant Shares obtainable
upon exercise of this Warrant shall be increased to a number of shares equal to
the number of shares of Common Stock obtainable immediately prior to the close
of business on the record date fixed for the determination of holders of Common
Stock entitled to receive the Distribution multiplied by the reciprocal of the
fraction set forth in the immediately preceding clause (i), or (B) in the event
that the Distribution is of common stock of a company whose common stock is
traded on a national securities exchange or a national automated quotation
system, then the holder of this Warrant shall receive an additional warrant to
purchase Common Stock, the terms of which shall be identical to those of this
Warrant, except that such warrant shall be exercisable into the amount of the
assets that would have been payable to the holder of this Warrant pursuant to
the Distribution had the holder exercised this Warrant immediately prior to such
record date and with an exercise price equal to the amount by which the exercise
price of this Warrant was decreased with respect to the Distribution pursuant to
the terms of the immediately preceding clause (i).

                  (f) Certain Events. If any event occurs of the type
contemplated by the provisions of this Section 8 but not expressly provided for
by such provisions (including, without limitation, the granting of stock
appreciation rights, phantom stock rights or other rights with equity features),
then the Company's Board of Directors will make an appropriate adjustment in the
Warrant Exercise Price and the number of shares of Common Stock obtainable upon
exercise of this Warrant so as to protect the rights of the holders of the
Preferred Share Warrants; provided that no such adjustment


                                      -13-
<PAGE>

pursuant to this Section 8(f) will increase the Warrant Exercise Price or
decrease the number of shares of Common Stock obtainable as otherwise determined
pursuant to this Section 8.

                  (g)      Notices.

                      (i) Immediately upon any adjustment of a Warrant Exercise
Price, the Company will give written notice thereof to the holder of this
Warrant, setting forth in reasonable detail, and certifying, the calculation of
such adjustment.

                      (ii) The Company will give written notice to the holder of
this Warrant at least ten (10) days prior to the date on which the Company
closes its books or takes a record (A) with respect to any dividend or
distribution upon the Common Stock, (B) with respect to any pro rata
subscription offer to holders of Common Stock or (C) for determining rights to
vote with respect to any Organic Change (as defined below), dissolution or
liquidation, provided that such information shall be made known to the public
prior to or in conjunction with such notice being provided to such holder.

                      (iii) The Company will also give written notice to the
holder of this Warrant at least ten (10) days prior to the date on which any
Organic Change, dissolution or liquidation will take place, provided that such
information shall be made known to the public prior to or in conjunction with
such notice being provided to such holder.

         Section 9. Purchase Rights; Reorganization, Reclassification,
Consolidation, Merger or Sale.

                  (a) In addition to any adjustments pursuant to Section 8
above, if at any time the Company grants, issues or sells any Options,
Convertible Securities or rights to purchase stock, warrants, securities or
other property pro rata to the record holders of any class of Common Stock (the
"Purchase Rights"), then the holder of this Warrant will be entitled to acquire,
upon the terms applicable to such Purchase Rights, the aggregate Purchase Rights
which such holder could have acquired if such holder had held the number of
shares of Common Stock acquirable upon complete exercise of this Warrant
immediately before the date on which a record is taken for the grant, issuance
or sale of such Purchase Rights, or, if no such record is taken, the date as of
which the record holders of Common Stock are to be determined for the grant,
issue or sale of such Purchase Rights.

                  (b) Any recapitalization, reorganization, reclassification,
consolidation, merger, sale of all or substantially all of the Company's assets
to another Person or other transaction in each case which is effected in such a
way that holders of Common Stock are entitled to receive (either directly or
upon subsequent liquidation) stock, securities or assets with respect to or in
exchange for Common Stock is referred to herein as an "Organic Change." Prior to
the consummation of any (i) sale of all or substantially all of the Company's
assets to an acquiring Person or (ii) other Organic Change following which the
Company is not a surviving entity, the Company will secure from the Person
purchasing such assets or the successor resulting from such Organic Change (in
each case,


                                      -14-
<PAGE>

the "Acquiring Entity") a written agreement (in form and substance satisfactory
to the holders of Preferred Share Warrants representing at least two-thirds
(2/3) of the shares of Common Stock obtainable upon exercise of the Preferred
Share Warrants then outstanding) to deliver to each holder of Preferred Share
Warrants in exchange for such Warrants, a security of the Acquiring Entity
evidenced by a written instrument substantially similar in form and substance to
this Warrant and satisfactory to the holders of the Preferred Share Warrants
(including, an adjusted warrant exercise price equal to the value for the Common
Stock reflected by the terms of such consolidation, merger or sale, and
exercisable for a corresponding number of shares of Common Stock acquirable and
receivable upon exercise of the Preferred Share Warrants (without regard to any
limitations or exercise), if the value so reflected is less than any Warrant
Exercise Price in effect immediately prior to such consolidation, merger or
sale). Prior to the consummation of any other Organic Change, the Company shall
make appropriate provision (in form and substance satisfactory to the holders of
Preferred Share Warrants representing a [majority] of the shares of Common Stock
obtainable upon exercise of the Preferred Share Warrants then outstanding) to
insure that each of the holders of the Preferred Share Warrants will thereafter
have the right to acquire and receive in lieu of or in addition to (as the case
may be) the shares of Common Stock immediately theretofore acquirable and
receivable upon the exercise of such holder's Preferred Share Warrants (without
regard to any limitations or exercise), such shares of stock, securities or
assets that would have been issued or payable in such Organic Change with
respect to or in exchange for the number of shares of Common Stock which would
have been acquirable and receivable upon the exercise of such holder's Warrant
as of the date of such Organic Change (without taking into account any
limitations or restrictions on the exerciseability of this Warrant).

         Section 10. Lost, Stolen, Mutilated or Destroyed Warrant. If this
Warrant is lost, stolen, mutilated or destroyed, the Company shall promptly, on
receipt of an indemnification undertaking (or, in the case of a mutilated
Warrant, the Warrant), issue a new Warrant of like denomination and tenor as
this Warrant so lost, stolen, mutilated or destroyed.

         Section 11. Notice. Any notices, consents, waivers or other
communications required or permitted to be given under the terms of this Warrant
must be in writing and will be deemed to have been delivered: (i) upon receipt,
when delivered personally; (ii) upon receipt, when sent by facsimile (provided
confirmation of transmission is mechanically or electronically generated and
kept on file by the sending party); or (iii) one Business Day after deposit with
a nationally recognized overnight delivery service, in each case properly
addressed to the party to receive the same. The addresses and facsimile numbers
for such communications shall be:

         If to the Company:

                  Log On America, Inc.
                  Three Regency Plaza
                  Providence, Rhode Island 02903
                  Telephone:        (401) 453-6100
                  Facsimile:        (401) 459-6222
                  Attention:        Kenneth M. Cornell


                                      -15-
<PAGE>

         With a copy to:

                  Silverman, Collura & Chernis, P.C.
                  381 Park Avenue South, Suite 1601
                  New York, New York 10016
                  Telephone:        (212) 779-8600
                  Facsimile:        (212) 779-8858
                  Attention:        Peter Silverman, Esq.


If to a holder of this Warrant, to it at the address and facsimile number set
forth on the Schedule of Buyers to the Securities Purchase Agreement, with
copies to such holder's representatives as set forth on such Schedule of Buyers,
or at such other address and facsimile as shall be delivered to the Company upon
the issuance or transfer of this Warrant. Each party shall provide five days'
prior written notice to the other party of any change in address or facsimile
number. Written confirmation of receipt (A) given by the recipient of such
notice, consent, waiver or other communication, (B) mechanically or
electronically generated by the sender's facsimile machine containing the time,
date, recipient facsimile number and an image of the first page of such
transmission or (C) provided by a nationally recognized overnight delivery
service shall be rebuttable evidence of personal service, receipt by facsimile
or receipt from a nationally recognized overnight delivery service in accordance
with clause (i), (ii) or (iii) above, respectively.

         Section 12. Date. The date of this Warrant is ________ __, 2000. This
Warrant, in all events, shall be wholly void and of no effect after the close of
business on the Expiration Date, except that notwithstanding any other
provisions hereof, the provisions of Section 7(c) shall continue in full force
and effect after such date as to any Warrant Shares or other securities issued
upon the exercise of this Warrant.

         Section 13. Amendment and Waiver. Except as otherwise provided herein,
the provisions of the Preferred Share Warrants may be amended and the Company
may take any action herein prohibited, or omit to perform any act herein
required to be performed by it, only if the Company has obtained the written
consent of the holders of Preferred Share Warrants representing at least
two-thirds (2/3) of the shares of Common Stock obtainable upon exercise of the
Preferred Share Warrants then outstanding; provided that no such action may
increase the Warrant Exercise Price of the Preferred Share Warrants or decrease
the number of shares or class of stock obtainable upon exercise of any Preferred
Share Warrants without the written consent of the holder of such Preferred Share
Warrant.

         Section 14. Descriptive Headings; Governing Law. The descriptive
headings of the several sections and paragraphs of this Warrant are inserted for
convenience only and do not constitute a part of this Warrant. The corporate
laws of the State of Delaware shall govern all issues concerning the relative
rights of the Company and its stockholders. All other questions concerning the
construction, validity, enforcement and interpretation of this Warrant shall be
governed by the internal laws of the State of New York, without giving effect to
any choice of law or conflict of law


                                      -16-
<PAGE>

provision or rule (whether of the State of New York, or any other jurisdiction)
that would cause the application of the laws of any jurisdiction other than the
State of New York.

                            [Signature Page Follows]


<PAGE>

         IN WITNESS WHEREOF, the Company has caused this Warrant to be signed by
_________________, its ___________________, as of the ______ day of ___________.


                                                        LOG ON AMERICA, INC.

                                                        By:
                                                            --------------------
                                                        Name:
                                                             -------------------
                                                        Title:
                                                              ------------------

<PAGE>
                              EXHIBIT A TO WARRANT

                                SUBSCRIPTION FORM

        TO BE EXECUTED BY THE REGISTERED HOLDER TO EXERCISE THIS WARRANT

                              LOG ON AMERICA, INC.

         The undersigned holder hereby exercises the right to purchase
_________________ of the shares of Common Stock ("Warrant Shares") of Log On
America, Inc., a Delaware corporation (the "Company"), evidenced by the attached
Warrant (the "Warrant"). Capitalized terms used herein and not otherwise defined
shall have the respective meanings set forth in the Warrant.

         1. Form of Warrant Exercise Price. The Holder intends that payment of
the Warrant Exercise Price shall be made as:

                  ____________      a "Cash Exercise" with respect to __________
                                    Warrant Shares; and/or

                  ____________      a "Cashless Exercise" with respect to ______
                                    Warrant Shares (to the extent permitted by
                                    the terms of the Warrant).

         2. Payment of Warrant Exercise Price. In the event that the holder has
elected a Cash Exercise with respect to some or all of the Warrant Shares to be
issued pursuant hereto, the holder shall pay the sum of $___________________ to
the Company in accordance with the terms of the Warrant.

         3. Delivery of Warrant Shares. The Company shall deliver to the holder
__________ Warrant Shares in accordance with the terms of the Warrant.

Date: _______________ __, ______


--------------------------------
   Name of Registered Holder

By:
    ----------------------------
    Name:
    Title:


<PAGE>


                              EXHIBIT B TO WARRANT
                              --------------------

                              FORM OF WARRANT POWER

FOR VALUE RECEIVED, the undersigned does hereby assign and transfer to
________________, Federal Identification No. __________, a warrant to purchase
____________ shares of the capital stock of Log On America, Inc., a Delaware
corporation, represented by warrant certificate no. _____, standing in the name
of the undersigned on the books of said corporation. The undersigned does hereby
irrevocably constitute and appoint ______________, attorney to transfer the
warrants of said corporation, with full power of substitution in the premises.


Dated:  _________, ____




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

                                            By:
                                                   -----------------------------
                                            Its:
                                                   -----------------------------