I had a network connection working before with a SIM800L. Then I switched the SIM800L with a new SIM800L unit and now I seem to get CREG error 3. I also can not see any network with the COPS=? Command.
The SIM does work correctly in my cell phone and I can send texts to it and use DATA on the hologram network.
Here are the modem Diagnostic results:
AT -> OK
ATI -> SIM800 R14.18
AT+CGMI -> SIMCOM_Ltd
AT+CGMM -> SIMCOM_SIM800L
AT+GMM -> SIMCO M_SIM800L
AT+CPIN? -> +CPIN: READY
AT+CCID -> “I have hidden this for the forum but it comes up as a long string of numbers and a letter”
AT+CRSM=176,28539,0,0,12 -> +CRSM: 144,0,“FFFFFFFFFFFFFFFFFFFFFFFF”
AT+CFUN? -> +CFUN: 1
AT+CSQ -> +CSQ: 0,0
Signal did not appear last time until I was actually connected. Then I ranged between 11 and 13. The signal on my phone is almost full in my location. I have tried multiple antennas including one I know to have worked. However, it may be possible I do not have strong enough signal?
AT+CREG? -> +CREG: 1,0 will also say 1,2 amd 1,3 if I turn toggle CFUN=4 and CFUN=1. CREG notification bouncing between 0 and 2 as well.
AT+CGREG? -> +CGREG: 1,0
AT+CGACT? -> IF I try to attach it with AT+CGACT=1 I get ‘ERROR’ and AT+CGACT=1,1 also gives ‘ERROR’.
AT+COPS? -> +COPS: 0
AT+COPS=? -> +COPS: ,(0-4),(0-2)
Again, the SIM in my cellphone works correctly and quickly, SMS and DATA from the same location. I have SIM800L hooked up to a laboratory-grade power supply at 4v and 2A Continuous voltage. I have tried up to 4.6V and low as 3.8V. Was connected to a network with another SIM800L bought in the same batch. But I blew it up by accident with a faulty power supply.
I am in Toronto Canada, would be on 2G rogers network roaming. Expecting CREG 5 but not seeing it. I have actually tried 2 separate SIM800L units with the same responses. I can not register to network and I DO see CREG 3, denied response after restting the CFUN from 4 to 1. No idea what to try next. I have given it 30 hours on continuously and have tried keeping it off for 2 hours. Any suggestions would be greatly appreciated.
Thank you in advance for any help or ideas.