Cellular Phreaking :: essays research papers

Cellular PhreakingThe machinerellular/mobile phvirtuoso system is one that is perfectly set up to beexploited by phreaks with the fit knowledge and equipment. Thanks toderegulation, the regional BOCs (Bell Operating Companies) are scattered and donot communicate much with each other(a). Phreaks can take expediency of this bypretending to be mobile ring customers whose " home office metrical unit" is a city served by adifferent BOC, known as a "roamer". Since it is impractical for each BOC tokeep track of the customers of all in all the other BOCs, they pass on usually allow thecustomer to make the scrubs he wishes, often with a surcharge of some sort.The bill is then forwarded to the roamers home BOC for collection. However,it is fairly simple (with the correct tools) to create a bogus ID tour foryour mobile phone, and pretend to be a roamer from some other city and state,thats "just visiting". When your BOC tries to collect for the calls from your alleged "home BOC", they will discover you are not a real customer barely by then,you can create an entirely new electronic identity, and use up that instead.How does the cellular system know who is calling, and where they are? When amobile phone enters a cells area of transmission, it transmits its phone physiqueand its 8 digit ID number to that cell, who will keep track of it until it getsfar enough away that the lowering quality is sufficiently diminished, and then thephone is "handed off" to the cell that the customer has walked or driven into.This process continues as long as the phone has power and is turned on. If thephone is turned off (or the car is), someone attempting to call the mobile phonewill receive a recording along the lines of "The mobile phone customer you havedialed has odd the vehicle or driven out of the service area." When a call ismade to a mobile phone, the switching equipment will check to see to it if the mobilephone being ca lled is "logged in", so to speak, or act in one of the cells.If it is, the call will then act (to the verbalize parties) just like a normalcall - the caller whitethorn hear a busy tone, the phone may just ring, or the call maybe answered.How does the switching equipment know whether or not a particular phone isauthorized to use the network? some(prenominal) times, it doesnt. When a dealer installsa mobile phone, he gives the phones ID number (an 8 digit hexadecimal number)