About GSM SMS module

1. The specification requires 1A, but does not require 1A to work normally. However, the peak current of the module may reach 1A, so the power supply system is required to be1a. Because GSM is networked, when the network switches and the signal is poor, it will suddenly consume electricity. If the power supply can't keep up, it will cause the module to restart.

2.0. 1mA should not be enough. Generally, the standby mode of the module is 2-5mA, which will be slightly higher if there is no power saving mode. The call is generally above 100 to 200mA. You should check whether the AT command or serial port can communicate to determine whether the module has been powered on. Generally, the module has a power-on reset pin (it takes some time to connect to a low level-such as the power-on key of a mobile phone).