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Easy project on how to dial phone numbers using the SIM800L and as a project a GSM Tripwire alarm that will call you whenver someone passes. By SurtrTech. Important: the SIM800L works on 2G networks, so it will only work in your country, if 2G networks are available. Check if you have 2G network in your country, otherwise it won’t work. Watch the Video Tutorial. You can watch the video tutorial or continue reading for the complete project instructions. I got a SIM800L, same as the one under this link, Quickstart SIM800 (SIM800L) With Arduino, and played around with an Arduino Nano and Uno. I had a few problems, at the start, not getting it work properly. It turned out that my Nano 5V pin wasn't enough for the SIM unit. It works fine with Uno though.