| "edit of my previous post" The phone isn't used in the system. You only need the sim card out of it. When the sim card runs out of funds for time you use the phone to add time to it. Buying the phone allows you to have a dedicated phone number for the system. This way you can also make calls to the phone number and have the microcontroller start the car, lock or unlock the car or activate the cars security system from basically anywhere in the world. That part is done using a DTMF code module. Probably giving away to much info, lol!
 
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