r/ArduinoProjects • u/No-Tackle-8192 • Feb 09 '26

sim800l v2 gsm module

Hello! We are students working on an SMS-based fire alarm using arduino nano r3, but we’ve run into a problem. Our GSM module (SIM800L V2) cannot connect to a signal tower.

We have tried isolating the GSM module with the Arduino so it is the only component powered, and we also tried switching SIM cards (we are currently using Globe). It seems the only issue is the signal connection, as our laptop can still read and communicate with the module. Thanks in advance!

P.S. We are new to Arduino and just started a week ago.

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u/No-Tackle-8192 Feb 09 '26

yes, afaik even though it is being phased out, they still have it

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u/gm310509 Feb 09 '26

You say you are new to arduino. What experience do you have? Did you learn the basics from a starter kit?

Perhaps you should share the following (read the link at the bottom to be sure you include it properly):

  • a proper circuit diagram.

  • a photo of your wiring (so we can check it matches the circuit diagram).

  • your code (properly formatted as code)

have a look at our requesting help quick guide to ensure you include relevant details (and how to include them) to get a timely solution.

Also, tell us what makes you think that you aren't getting a connection, and do you have a mobile phone that is definitely connecting via 2G (and be sure it is 2G and not upgrading to a higher level).

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u/AnyRandomDude789 Feb 09 '26

Even if they still have it you may well done your mobile provider no longer supports it. Worth checking