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I've bought such on Amazon. My main problem is that it stays in 1sec-blink, meaning it can't registrer cellular network.

First I tried with all anntennas possiblities (one of each, both, none) - failed.

Using NodeMCU (for 3.3 TxRx) and SoftwareSerial.h to communicate. It answers all AT command as expected.

I tried several powering possibilities (as noted extensively about 2A on the internet), including 18650 , 2000mAh battery connected only to SIM800L module with no MCU connected, still same state.

What Can be done else?

SEE PELEPHONE: Carrier support - "PELEPHONE"

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  • is the SIM card valid?
    – jsotola
    Commented Jun 3, 2022 at 6:37
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    Are you connecting to a suitable network? Not all networks will work with SIM800L. GSM/GPRS is obsolete now and being gradually switched off by operators around the globe.
    – Majenko
    Commented Jun 3, 2022 at 13:27
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    You're with PelePhone? Well, 2G says "N/A". So no, simply no.
    – Majenko
    Commented Jun 3, 2022 at 15:37
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    Correct. en.wikipedia.org/wiki/2G -- For PelePhone you need an LTE or better modem.
    – Majenko
    Commented Jun 3, 2022 at 15:56
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    The 800 in SIM800L does not refer to the frequency. The SIM800L works on 850/900/1800/1900MHz. So pretty much any 2G network.
    – Majenko
    Commented Jun 3, 2022 at 17:09

1 Answer 1

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Your mobile network provider does not provide a 2G (GPRS / GSM) network.

2G is graduallly being phased out around the globe, so switching to an LTE modem is really the way forward.

If you still want to use the SIM800L then you need a network provider that gives 2G services. Fortunately the SIM800L is a "quad band" modem, so it will work with pretty much any 2G provider (it works on 850/900/1800/1900MHz, hence the "quad" of "quad band").

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