Quote Originally Posted by pedja089 View Post
Maybe problem is in supply voltage. Modem works on 2.8V(it have internal regulator), so pic should work on 3.3V, and you must have serial resistor on pic TX. So modem can't draw any current from pic TX pin.
Probably that is the case I'm having trouble with...serial resistor? Like a voltage divider?
Here is the general Specification of the GSM
Power Input:
5V-7.5VDC @ 1.5A

I/O Interface:
UART 3.3V Logic 5V Tolerant

Regards,
tacbanon