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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"

guyd
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1 Answers1

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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").

Majenko
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