I hope you are not being ironic...
In case you don't, I have to say that such a project is not simple or for the novice. You must have a good understanding of serial communication and can suggest few books to read and of course hardware knoledge of the devices you are going to use.
In the case of mobiles, you have to do 2 way communication with the device under control to make sure that all your settings are processed. Even a single AT must be replied with an OK and your PIC should received it before sending any new commands.
Also every phone/module have additional commands special to itself.
If you have written some code but want to check it or debug it, feel free to post it here.
Ioannis
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