GPS/GPRS/GSM Module V3.0 arduino - CME Error 10

Hello. Faced with problem when working with Shield GPS/GPRS/GSM Module V3.0. After a couple of minutes after starting shield, he writes, "Sim not inserted." Tried more than 3 sim cards. On the Arduino connect external source (12v, 750 mAh). Yesterday I happened to run the sim card and send yourself an SMS. Using demo example (Run GSM mode via USB). Using standart baudrate 115200.
query: AT+CADC
response: +CADC: 1,7
query: AT+CADC
response: +CADC: 1,7

2015-04-24 02:27:53 It's a little hard to get start ~
what kind of the external power supply you are using? a battery or a charger/adapter ? i am using a charger with 7.5v 2A, it workd well.
Leff
what kind of the external power supply you are using? a battery or a charger/adapter ? i am using a charger with 7.5v 2A, it workd well.
