Some logs:
adb logcat -b radio
E/RILD ( 148): **RIL Daemon Started**
E/RILD ( 148): **RILd param count=1**
E/RILD ( 148): RIL_Init argc = 4 client = 0
E/RILPROXY( 145): Could not connect to rild socket, retrying: Connection refused
E/RILPROXY( 145): Could not connect to rild socket, retrying: Connection refused
E/RILPROXY( 145): Could not connect to rild socket, retrying: Connection refused
E/RILPROXY( 145): Could not connect to rild socket, retrying: Connection refused
W/RILC ( 148): RIL_onUnsolicitedSendResponse called before RIL_register
E/RILC ( 148): isMultiSimEnabled: prop_val = 0 enabled = 0
E/RILC ( 148): RIL_register: RIL version 6
E/RILC ( 148): s_registerCalled = 1, s_started = 1, RIL_getMaxNumClients = 1
E/RILC ( 148): isMultiSimEnabled: prop_val = 0 enabled = 0
E/RILC ( 148): responseSimStatus: A RilCardStatus_v6 or _v5 expected
E/RILC ( 148): responseSimStatus: A RilCardStatus_v6 or _v5 expected
E/RILC ( 148): responseSimStatus: A RilCardStatus_v6 or _v5 expected
E/RILC ( 148): responseSimStatus: A RilCardStatus_v6 or _v5 expected
adb logcat
I/Gecko ( 495): -*- RILContentHelper: Received message 'RIL:VoiceInfoChanged': {"connected":true,"emergencyCallsOnly":false,"roaming":false,"network":{"rilMessageType":"operatorchange","longName":"Polska Telefonia Cyfrowa (PTC)","shortName":"Era","mcc":"260","mnc":"02"},"cell":{"gsmLocationAreaCode":45071,"gsmCellId":1072191},"type":"gsm","signalStrength":-77,"relSignalStrength":58,"state":"registered"}
I/Gecko ( 144): -*- RILContentHelper: Received message 'RIL:VoiceInfoChanged': {"connected":true,"emergencyCallsOnly":false,"roaming":false,"network":{"rilMessageType":"operatorchange","longName":"Polska Telefonia Cyfrowa (PTC)","shortName":"Era","mcc":"260","mnc":"02"},"cell":{"gsmLocationAreaCode":45071,"gsmCellId":1072191},"type":"gsm","signalStrength":-77,"relSignalStrength":58,"state":"registered"}
I/Gecko ( 144): -*- RILContentHelper: Received message 'RIL:DataInfoChanged': {"connected":false,"emergencyCallsOnly":false,"roaming":false,"network":{"rilMessageType":"operatorchange","longName":"Polska Telefonia Cyfrowa (PTC)","shortName":"Era","mcc":"260","mnc":"02"},"cell":{"gsmLocationAreaCode":45071,"gsmCellId":1072191},"type":"umts","signalStrength":-77,"relSignalStrength":58,"state":"registered"}
I/Gecko ( 495): -*- RILContentHelper: Received message 'RIL:DataInfoChanged': {"connected":false,"emergencyCallsOnly":false,"roaming":false,"network":{"rilMessageType":"operatorchange","longName":"Polska Telefonia Cyfrowa (PTC)","shortName":"Era","mcc":"260","mnc":"02"},"cell":{"gsmLocationAreaCode":45071,"gsmCellId":1072191},"type":"umts","signalStrength":-77,"relSignalStrength":58,"state":"registered"}
I/Gecko ( 465): -*- RILContentHelper: Received message 'RIL:DataInfoChanged': {"connected":false,"emergencyCallsOnly":false,"roaming":false,"network":{"rilMessageType":"operatorchange","longName":"Polska Telefonia Cyfrowa (PTC)","shortName":"Era","mcc":"260","mnc":"02"},"cell":{"gsmLocationAreaCode":45071,"gsmCellId":1072191},"type":"umts","signalStrength":-77,"relSignalStrength":58,"state":"registered"}