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- CELLULAR TELEPHONE PHREAKING PHILE SERIES VOL 1 by The Mad Phone-man
-
- How would ya like to have a phone that no body could locate? How bout free
- phone service on it too? Well Cellular telephones have the potential to do
- all this and more. First lets discuss some basics of the service.
-
- QUESTIONS & ANSWERS:
- --------------------
- Q:What is cellular; a cellular phone?
- A: A 800 mhz radiotelephone, running 3 watts, with the ability to change
- channel on computer command from the central switch. This happens when you
- travel thru the service area and your signal becomes stronger at a neighboring
- cell base station.
- Q: They are marketed as a high security device with no possibility of anyone
- making a phoney call and charging it to someone else, how can it be phreaked?
- A: An understanding of the phone reveals that every time a call is made, the
- phone number,an electronic serial number, and other data is sent to the switch.
- If you were to listen to the oposite side of the control channel as the call
- is being "set-up" you would hear this data being transmitted to the switch in
- NRZ code (non-return to zero). All one has to do, is record this info and
- program the bogus phone to these params and a free call is possible thru the
- switch.
- Q: Has anyone done this yet?
- A: YES, about 6 months after the first cellular phone system was "turned-up"
- a technician programmed a panasonic telephone with a NEC E.S.N. (Electronic
- serial number) this was reportedly done for a gram of coke. With the popular
- ROM programmers available today, almost any NAM (Numeric Assignment Module)
- can be duplicated or copied with changes. (The NAM is the heart of the billing
- information and contains the phone number but not the ESN) The most popular
- integrated circut for NAMs is the 74LS123.
- Q: This sounds like a lot of trouble, is there easier ways to get service?
- A: SURE, the cellphone companies have been their own downfall. In an effort
- market their wares as a universal service (Your phone will work in any system)
- they have let the cart get before the horse. Nobody can tell if a phone from
- another city (that has a roaming agreement) is valid till its too late. The
- only thing they could do after finding out is block any call with the bad
- ESN because as we know, the phone number is easy to change, but the ESN is
- not. So heres a likely plot...a roamer identifying itself as a number from
- Chicago non-wireline accesses a Cellular system in Dallas. Sometimes an
- operator intervienes but you can bullshit them as long as you know the
- information you have programmed into your phone. Then you make calls just
- like you are a local user. If you're found out, you remove the number,
- change it to another, and see if that works. Usualy it will require the
- radio's ESN chip to be changed, but thats a lot easier if you have a ZIF
- (zero insertion force) socket installed, thats what I use.
-
- Upcomming soon, more good info on particular mfgrs ESN codes.
- Cracking the Motorola switch, Shortcommings of the Ericcson AXE-10 switch.
-
- >>> The Mad Phone-man <<<
-