I would like to send data over the Mobile network using a Raspberry Pi. Can I buy any GPRS shield made for Arduino like this one http://www.seeedstudio.com/wiki/GPRS_Shield_V2.0 and connect it wire by wire to a raspberry pi? Will I then need a library like arduPi du communicate with it?
Yes, This one from ElecFreaks:
using this adapter
The shield is programmed via a serial port, using AT commands.
There is information in the Elecfreaks site regarding the AT programming for making calls and sending/receiving SMS, including a sample sketches for arduino, but nothing related to gprs operation.