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I also had troubles using the gprs shield on a raspberry pi. if i’ve connected the gprs shield with my pc over usb everything worked as expected.

it seems like on my shield pin 20 (GND) from the raspberry pi header is connected with pin 24 (VDD_EXT, 2.8V output) of the M66 which results in a short-circuit when the gprs board is connected with the raspberry pi.

as gorurakif ponted out in post 1418 breaking the connection between pin 20 and the shield solved the problem.