please guy
i want to know about lock circuit for oversea phone call or undesirable phone number circuit with microcontroller. please give or indicate me how can i start and search or study.
A phone is pretty hard to disassemble and reprogram. Further on - If you shall have any hope to be able to alter your phone into something else, you need a lot og documentation for that spesific phone.
It's lot easier to get a propriate app to your phone, I'll say.