Can't online using GSM SIM800L

I am using AdafruitFONA library and SIM800L as my module.

By using FONAtest library, I was trying to enable GPRS. With my local APN (app.mnvo), i can't get my GSM to connect.

Any suggestion?


If you are using a standalone SIM800 module you need to provide it with a 2 amp 4 volt power supply. You cannot power it from an Arduino system and in any case 5V from an Arduino can destroy a SIM800.

SIM800's also communicate at 2.8V - you need an interface converter to convert an Arduino's 5V serial signals to the 2.8V SIM800 signals.

I have a SIM800 module running just fine having resolved the above two problems.


Catweazle NZ