hello...

i success sending sms using pic16F84A..

1st---what phone or modem u want use.
2nd---the phone or modem must have at command
3rd--- if use PIC16F84A must use 8Mhz because the speed.
4th--- what languase u want use.(MPLAB,PIC BASIC PRO,C,PROTON)
5----- u must know about serial comunication.

hope this help u. sorry for my bad english...