Arduino and GPRS module Problem with D1 EPlus

Hi,

i have an GPRS moule from Libelium with the Sagem HiLo Chipset.
After Powering the Modul with 5V Extern and ad the Capacytor. It works well.... but only with an E Plus Card. When insert an D1 Card a cant sent SMS or make a call. I have bout an New Prepaid Card from D1 and it ist the same Problem.

Anny hints and sorry for my poor english.

Stefan

It is solved !

I hab powerd the Arduino with 5V 2,2 A and the Jumper on the GPRS Shield was on USB after switsching to Externel Power and give the Power direckt to the Shield all was working.

Stefan