This project shows how to build a SMS remote controller. This SMS controller is able to control the power (On-Off) of 4 devices and read the status of 8 switches. It uses a GSM module and easy to find components. The heart of this controller is a ATtiny2313 and a GM-47 GSM module. SMS command execution is protected under a programmable password.
SMS remote controller V3.0 – [Link]