How long should nRF9160 stay in CEREG mode 4 on startup?

[Jonathan]

When I start my nRF9160 modem (AT+CFUN=1) it can sit in CEREG mode 4 (unknown) for a couple of minutes, before it switches to 2 (searching) then 1 (registered).

Is that normal? Is there any way to speed it up?

It is running modem firmware 1.0.1.

[Sigurd]

Jonathan said:

Is there any way to speed it up?

If you know what band you want to connect on, you can set it with AT command %XBANDLOCK. After you have done that, save the modem settings to persistent storage with AT+CFUN=0. You will then only search on the bands specified, and it should reduce the time spent searching/connecting to the network.