Individual GSM, WCDMA, iDEN and some satellite phone devices are uniquely identified by an International Mobile Equipment Identity (IMEI) number.
All GSM phones use a SIM card to allow an account to be swapped among devices.
Wile E. can merely drop an order into a mailbox (or enter an order on a website, as in the Looney Tunes: Back in Action movie), and have the product in his hands within seconds.
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