iComSat v1.1 network login issue

Hi there. My iComSat v1.1 shield doesn't seem to logon to the GSM network. The status LED is permanently on and the NET LED just flashes. What can be the problem? Thanks.

I had the same problem. I changed position of rx/tx jumpers from pin0 and pin1 to pin4 and pin5 (softserial, sketch is from Itead Studio). Now it works fine.