EXHIBIT 10.15 November 9, 1999 Mr. Paul B. Silverman 9520 Center Street Vienna, Virginia 22181 Dear Mr. Silverman: The Board of Directors of SecurFone America, Inc. has proposed that the term of the executive employment agreement between you and the...

                                                            EXHIBIT 10.15


November 9, 1999


Xx. Xxxx X. Xxxxxxxxx
0000 Xxxxxx Xxxxxx
Xxxxxx, Xxxxxxxx 00000

Dear Xx. Xxxxxxxxx:

The Board of Directors of SecurFone America, Inc. has proposed that the term of
the executive employment agreement between you and the Company dated November 1,
1998 be extended to December 31, 1999. All other terms of the agreement would
remain unchanged. Please sign below to acknowledge your agreement with the terms
of this letter.


Sincerely,


/s/ Xxxxxx X. Xxxx
----------------------------
SecurFone America, Inc.
Xxxxxx X. Xxxx,



I agree to the terms of this letter as of the date appearing above.


/s/ Xxxx X. Xxxxxxxxx
-----------------------------
Xxxx X. Xxxxxxxxx