Hi! Please read my post again. What you are trying to do is a complicated project. Not for the novice. If you insist on doing it, then do it with small steps, one task at a time.

1. Select your mobile device. READ CAREFULLY the Data Sheet and get acquainted with it.

2. Use only the USART of your PIC (you need of course level translation like a MAX232).

3. Try to communicate with your mobile device with simple commands like AT and wait for the answer OK.

4. Then try more complicated tasks like sending SMS.

Also note that some commands like deleting SMS might take some time until they respond with OK. Not all commands execute immediatly!

Ioannis