SOS ROAD SERVICE CELLULAR COMMUNICATION

I would like to know how can I programm a GSM cellular, ( SIEMENS A50) if possible.
The idea is access its keypad thru AT COMMANDS.
The user press only a button ( not its keypad) and immediately the cellular calls to a central number.
The central atempts and the user speaks with the central via handsfree.

This application will be use in as a SOS ROAD SERVIVE. The equipment must be supplied by solar panel.

Anybody can help anyway?
GERALDOSOUZAAsked:
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joopvConnect With a Mentor Commented:
Almost any GSM phone can be programmed with AT commands.

Here is some interesting reading material:

http://www.riccibitti.com/tinyplanet/tiny_intro.htm
http://www.riccibitti.com/tinyplanet/tiny_article.htm
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