How to active GPRS Shield V2.0?

Projects General Guidance
1

I'm new in Arduino,

I use Arduino UNO, I have GPRS Shield V2.0 (GPRS Shield V2.0 | Seeed Studio Wiki), I want to active GPRS Shield V2.0, I have visited GPRS Shield V2.0 | Seeed Studio Wiki and did like tutorial provided:

I have inserted a SIM card to SIM Card Holder, I have rotated antenna like picture below:

I have made inserted jumper caps as below:

I have plugged GPRS Shield onto Arduino, I have powered up Arduino by USB cable with connected it to PC via USB cable,
When I tried to test with GSM Tools Test Modem provided arduino.cc (http://arduino.cc/en/Tutorial/GSMToolsTestModem), I got ERROR, when I opened serial monitor shown:

Starting modem test...ERROR, no modem answer.
Checking IMEI...Error: Could not get IMEI

What must I do so that my GPRS Shield v2.0 will active, my GPRS Shield v2.0 will join to network?

Please help me... thank you so much...

2

To know if your GPRS Shield is connected to network you have to look the LED status:
Net indicator(Green) Off SIM900 is not working
64ms On/800ms Off SIM900 does not find the network
64ms On/3000ms Off SIM900 finds the network
64ms On/300ms Off GPRS communication
I have a problem to connect to network with my personal SIM !
I you have news let me know.
thank you in advance

3

The SIM900-module draws 2 Amps peak when transmitting - Powering the module from your USB port won't work!

Also, looking at the schematics, the 4V for the Module is regulated from the VIN-pin on your Arduino, so it's impossible to get it working without a power supply.

Power your Arduino trough the DC-In jack with 7,5-9V 2A or more.

// Per.