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I think you shoud first get a CDMA or GPRS module for the phonecall purpose - most of them support AT commands. Then you can use the PIC to send AT commands from UART.
I think, you can use PL2303:
TTL output,
need not program,
quite simple circuit,
about 2$ 1pc.
from its datasheet:
Full compliance with the USB Specification v1.1 and USB CDC v1.1
Support the RS232 Serial interface
Support automatic handshake mode
Support Remote wake-up and power...
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