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however you interface a gsm module it need to a microcontroller to understand the DTMF(dial tone mode frequency) of your mobile…..
the bluetooth is a rf signal but it uses emf waves to propagate that means it contains both electrical and magnetical component
i.e. magnetic component (ur data eg.pictures, music….etc) guided by a electrical component so there is a possibilities for the bluetooth charger……
since i dont have enough time i am struggling with this one………..
i have a doubt how the blutooth mouse or keyboard works same principle wat the think is we have to write the coding for that in application layer of the bluetooth header format…….
i am not sure if there is any mistake means pls rectify it……