SIM900 library for Arduino Uno & Pro min

Hi,

Can you guys help me out with my SIM900 on my MEGA?

I posted here:

http://forum.arduino.cc/index.php?topic=325525.0

Im trying to understand either how to not use the included Arduino src/GSM library or if I should make a sketch to use that pre-packaged GSM library instead of my SIM900 library?

Thx