home *** CD-ROM | disk | FTP | other *** search
- CELLULAR TELEPHONE PHREAKING PHILE VOL 2 by "The Mad Phone-man"
-
- Some terms you should understand:
-
- Control Channel- The channel the phone and cell base first communicate on.
- Reverse Control Ch- The oposite frequency, 45 mhz lower than the control
- channel.This is where the mobile unit is.
- Voice channel- The channel you are assigned by the switch to commence the
- call on after the exchange of suscriber data.
- Reverse voice channel- Again 45mhz lower.
- Cell Site- The base station that talks to the mobile.
- Switch- The computer that places the calls, and takes and recieves data
- from the suscriber or from PSTN. (public switched tel netwk)
- OK that should get things started. A suscriber picks up his handset to
- place a call.
-
- The phone has already been locked onto the strongest control ch in the
- area by a computerized scanner in the phone. As he drives thru the service a
- the computer constantly picks out the strongest control ch and stays on it,
- altho more than one cell site can actualy be heard. The suscriber enters the
- number to call on the keypad, and presses the "send" button. At this time th
- folowing data is transmitted to the cell sit by the mobile. The callers
- electronic serial number (ESN) , his home system number (two digits) his
- mobile's area code and phone number, and the number he wants.The cellular
- switch now picks up an outgoing line, places the call for him and tells
- the mobile to switch to a voice channel. The two ends are linked in the
- central switch and violla! A complete phone call, in about 3 seconds.
-
- I have purposely over-simplified the whole process to point out the
- moment of truth. The mobile's ESN and phone number and the data in the
- switch must match or no go. This is how the billing is figgured out.If
- one had the ESN and the mobilephone number, you could call anytine
- anyplace without fear of trace, let alone bill. The ideal setup would
- let you listen to the reverse control channel, record and display heard
- working numbers and ESN's and recall them at your discression to make calls.
- This would be tits! Were not quite there yet. But some hard work has
- allready been done for us. All the aforementioned codes are sent
- in hex, in NRZ code (phancy term for phase shift keying) but the phone
- allready has, for example a NRZ receiver and transmitter built right in.
- All that has to be done is to have a receiver on the reverse control
- channel, recover the other suscribers data and save it or at least print
- it out. The mobile radio data books show some good technical stuff on
- the systems used and chip part numbers for the NRZ stuff. I know there
- is a mfgr using the lowley 8085 chip for the control head functions,
- seems like theres room for xperementin here.
-
- More to come!... "The Mad Phone-man"
-