Download this free terminal program and try the
modem with the serial port of your PC.
(Just 3 wires, RX,TX,GND)

The program is only an EXE file, no setup.

With this program you can create 12 macros.

Example of macro:

AT#013#010
This will send AT and "CR" + "LF" (cariage return + line feed)

Terminal program home page:
http://bray.velenje.cx/avr/terminal/

File download link:
http://bray.velenje.cx/avr/terminal/dl.php

Luciano