First select the mobile to be used. Then get their pdf to see the AT commands. After that things are pretty easy. Connect the mobile as an RS 232 device and control it from a PC or a PIC (do not forget the MAX232 chip!).

An example would be:

HSerout ["AT+CMGL=",34,"ALL",34,13] 'Check if there is new SMS

or:

HSerin 5000,ex_sms2,[wait("READ"),skip 4,waitstr command\10,skip 27,STR command\6\13] 'Check for number in waitstr command\10

Ioannis