Hello,
I have an NRF9160DK board and a custom board running the SLM application that are exhibiting similar behaviour. Both boards work fine with the supplied iBasis SIM. When I use some purchased SIMs from the operator Vodafone I cannot get past "searching" (CEREG: 2) - I've left it a couple of hours and no success. The Vodafone SIMS worked when I last tried them a couple of months ago, the signal strength is currently good (-90dBm) and Vodafone report no issues on their NB-IoT network according to their coverage map.
The notification output from the SLM contains:
+CNEC_ESM: 29,0 User authentication failed
+CNEC_EMM: 19 ESM Failure
I have contacted my supplier who have asked to check the APN settings. I don't think it is getting far enough through the network connection process for this to take affect though. Isn't APN after network connection?
Does anyone have any advice or experience that may assist me resolving this via the suppliers support?
Thank you.