When i insert a sim card into a new unconfigured BC660 I sometimes get two IP responses from the modem. The second one is invalid. In this case, it seems the modem is not able to communicate :
INFO: Sending Command(Modem): AT+COPS=4,2,26201
INFO: Received Response(Modem): +CFUN: 1
INFO: Received Response(Modem): +CPIN: READY
INFO: Received Response(Modem): +IP: 10.209.192.40
INFO: Received Response(Modem): +IP: 2a01:059d:c900:5ca7:0001:0001:481b:b497
Seems to be a problem in the BC660 Firmware.