I have recently purchased 10xSIM800l modems for use in a Arduino project. When I test the units using the correct voltage, 4.0v, and with 3A PSU and a SIM with external antenna I find that only 6 out of the 10 actually connect to a GSM network. eg quick flashing LED changes to slow flashing LED. Ca…

SIM800L GSM Network Connection Issues

Topic		Replies	Views
SIM800L connects to GSM network but doesn't connect to Arduino General Guidance	4	1087	May 5, 2021
Having problem connecting gsm module to the network (SIM800L ) Programming	5	2416	May 5, 2021
SIM800L verbindet nicht Deutsch	22	6948	May 6, 2021
Sim800L connects to GSM network but not to Arduino Hardware	2	333	May 7, 2021
Can't interact with sim800l module Home Automation	22	35395	May 6, 2021