Besides for call, cell phone can be used as Alarm sender device. You can connect it to alarm sistem to send SMS when alarm triggered.
PIC GSM SMS Alarm is a electronic project by trax tha has capability to sendi SMS when alarm triggered. It use Siemens GSM phone as sms sender and PIC 16F84A as main processor. The project has 5 inputs so it can send 5 different SMS messages.
via : circuitlake