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Topic: SIM800L GSM Network Connection Issues (Read 319 times) previous topic - next topic


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. 

Can I assume that its down to poor manufacturing or would I need to send AT commands to turn the RF side ON?  If it is poor manufacturing is their anything I can do to rectify the problem?

Thanks in adavnce

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