I want to use a SIM card in arduino, to turn on a system.
This is my application: I want to save phone numbers in arduino's memory and using GSM module -e.g to open and close garage door-. If i called the arduino SIM, arduino must compare the calling number with saved numbers, if it's exists in the memory, arduino opens the door. Else, arduino doesn't respond.
What's the best GSM module to use in this application?? and can you help me to construct the code??