Code review comment for lp:~rsalveti/phablet-extras/ofono-imei-revision

How to test:

phablet@ubuntu-phablet:/usr/share/ofono/scripts$ ./list-modems
[ /ril_0 ]
    Features = sms net gprs sim
    Emergency = 0
    Powered = 1
    Lockdown = 0
    Interfaces = org.ofono.CallVolume org.ofono.SmartMessaging org.ofono.PushNotification org.ofono.MessageManager org.ofono.NetworkRegistration org.ofono.VoiceCallManager org.ofono.ConnectionManager org.ofono.SimManager
    Online = 1
    Model = Fake Modem Model
    Revision = M9615A-CEFWMAZM-2.XXXXX
    Type = hardware
    Serial = 3539XXXXXXXXXX