FXT009: unable to set call forwarding

Hello,

we have SW FXT009 modem and we are using it to send SMS, but we also want to unconditionally forward any calls we receive to that number. The problem is, we can’t seem to enable call forwarding.

I tried enabling call forwarding in two ways:

AT+CCFC=0,3,"123456789"
ATD**21*123456789#

All I get back is +CME ERROR: 30, which is No network service error. I’m not sure what that means, but I can send SMS, dial in and dial out with the same modem without problem. I also plugged the SIM card into my own phone and I’m able to set call forwarding.

I’m connected to my provider:

AT+CREG?
+CREG: 2,1,"001C","2923"
AT+COPS?
+COPS: 0,2,29341

What can be the reason and how to solve the problem? Any ideas?