Cellular Phreaking The cellular/mobile phone system is one that is perfectly set up to be exploited by phreaks with the proper knowledge and equipment. Thanks to deregulation, the regional BOC's (Bell Operating Companies) are scattered and do not communicate much with each other. Phreaks can take advantage of this by pretending to be mobile phone customers whose "home base" is a city served by a different BOC, known as a "roamer". Since it is …
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…a friendly and unscrupulous dealer!). As to recording the numbers of other mobile phone customers and using them; as far as I know, this is just theory... but it seems quite possible, if you've got the equipment to record and decode it. The cellular system would probably freak out if two phones (with valid ID/phone number combinations) were both present in the network at once, but it remains to be seen what will happen.