This is when I try to read sim card in VTY:

root@gsm-desktop:~# telnet localhost 4247 Trying ::1... Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. Welcome to the OsmocomBB control interface OsmocomBB> en OsmocomBB# sim reader 1 OsmocomBB# % (MS 1) % SIM failed, replace SIM!

Any way, I was asked to replace the sim card.

This is when I check the MS 1 status:

show ms MS '1' is up, service is limited IMEI: 000000000000000 IMEISV: 0000000000000000 IMEI generation: fixed automatic network selection state: A6 no SIM inserted cell selection state: C7 camped on any cell (ARFCN 115) radio ressource layer state: idle mobility management layer state: MM idle, no IMSI

Thing is like the MS is fixed on the frequency band which mnc==01 is allocated. The way I did next is to replace the SIM card that belongs to the service of mnc==01 and it worked fine when I run the command of "sim reader 1".

I suspect that when the phone is in idle status, it scans the frequency band with strongest RSSI. After the VTY activated the sim card, the call connects as long as the frequency band and the sim card belonging to the same service provider. Is that the way it temporary works?

Regards,

Li

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