My first problem is that when i went through the datasheet of the SIM800l it says it requires a maximum voltage 4.2V. But each time i step down the voltage below 5v, the device does not come on. It only powers when the voltage is 5v. Please what can be the reason for this. I am powering my device using arduino uno.
Secondly, could this be the reason why my sim card does not communicate with GPRS but works with voice calls and sends SMS.