EC20 high power consumption

IN my design I am using EC20 Module and I just soldered EC20 module and the power supply side to the board. The EC 20 consume 300mA to 500mA (varying). Input voltage 4V.
I want to know why this module takes this much power

Please refer to EC20 hardware design. When the module register the network and do data transer, the current consumption will be up to a few hundred mA. And different networks, different current consumption.There are some part of current consumption from HD.