Why does it take so long for nRF9151DK to register on NB network?

[duxinglang]

I am developing a product for a customer using NRF9151(ncs2.7.0, modem fw: mfw_nrf91x1_2.0.2). While verifying it on the DK board, I discovered an issue. When the system starts searching and registering the network, the process is very long, taking about 7-8 minutes. I am sure that my SIM card is working properly and the environmental signal is also good. As a comparison, I can successfully register to the network in about 20 seconds using the NRF9160DK board. What is the reason for such a big difference between them?

This is the log information I captured:

37704.prj.conf

[Michal]

Hello,

Could you capture a modem trace of that issue? I think we will need that to properly debug this issue.

Also, have you tried the same SIM card in both nRF9160 and nRF9151 DKs?

Best regards,

Michal