GSM modem test point with data and SMS support

["Frank Bulk" <frnkblk () iname com>]

We have some interest in testing the real-world connectivity of several
cellular towers using a GSM modem that has both a IP address on the WWAN and
has SMS support.  Is anyone aware of a self-contained box that supports both
technologies?  EDGE support is preferred, but GPRS would be acceptable.

Frank