Current use by GSM Shield

Using Arduino Project Guidance
1

Hi all,
i am searching low power GSM/GPRS module. i find arduino GSM Shield i want to know how much current consume by this module at transmitting time. could anyone know so please tell me
if any other module which is easy to use so you can also tell me

http://arduino.cc/en/Main.ArduinoGSMShield

Thanks in advance

2

I thought of hearing something like 0.60 miliamps during a transmission and the supply voltage of the shield Is 5Volts. If you do the math you would get something like 0.30 watts.