[Problem] sim908 with arduino uno

Hello guys!!

I'm new in this arduino world and I don't have an idea of how to use the sim908 with arduino uno to do a webservice.

First of all, I can't get the shield to connect in gprs/gsm.

Do you guys have an example code? PS: The example code that there is in the arduino IDE doenst work.

I'm using a CLARO chip which has a pin 3636.