GBoard from ITead Studio - how to initialize?

Hello
has anybody experience concerning "GBoard" (from ITead Studio, with SIM900) ?
I try to use it, but I have only a library from arduino gsm shield.
I do not know to handle the sim card with its PIN and what else could be necessary?
Is there a good description?
Thank in advance
df0021
has anybody experience concerning "GBoard" (from ITead Studio, with SIM900) ?
I try to use it, but I have only a library from arduino gsm shield.
I do not know to handle the sim card with its PIN and what else could be necessary?
Is there a good description?
Thank in advance
df0021