I suggest you try it again, Luke.
Several transmissions were beamed to this ship by Rebel spies.
Individual GSM, WCDMA, iDEN and some satellite phone devices are uniquely identified by an International Mobile Equipment Identity (IMEI) number.
The swallow may fly south with the sun, and the house martin or the plover may seek warmer climes in winter, yet these are not strangers to our land.
All GSM phones use a SIM card to allow an account to be swapped among devices.