Part of wader.common.middleware.WCDMAWrapper
Returns a tuple with the network registration status
+CREG: 0,0 - Not registered and not scanning for a GSM network +CREG: 0,1 - Registered on the "HOME" network of the SIM +CREG: 0,2 - Not registered but is scanning for a GSM network +CREG: 0,3 - Registration is denied (Manual attempt failed) +CREG: 0,5 - Registered on to another network (roaming).Returns | (type: Deferred
) |