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- ┌┐ ╔═╧═══╧═╧═╧═╧═╧═╧═╧═╧═╧═╧═╗└┬┘
- │├───╢ THE DNA BOX ╟─┘
- ⌠││ ┌╢ Hacking Cellular Phones ╟────┐
- └┴┤ ⌡╚╤═╤═╤═╤═╤═╤═╤═╤═╤═╤═╤═╤═╤╝ ┌┴┐
- ⌡ ' ` ' ` ' ` ' ` ' ` ' ` ° └─┘
- ┬ P A R T T H R E E ⌠
- └─────────────────────────────────────────────────────────────────────────┘
- Previous DNA files discussed the possibility of using Japanese handheld
- HAM radios and personal computers, or tape recorders to hack Cellular Phone
- codes, and possible uses for investment & business info obtained by
- hacking executive and corporate phone calls, and investment info services,
- as well as approaches to modifying the Cellular Phones themselves for use as
- hacking tools and pirate communication devices.
-
- Here using and modifying UHF-band radio scanners to hack and monitor
- Cellular and Mobile telephone systems will be dealt with.
-
- Radio Shack, Uniden, and several other manufacturers make scanners
- for use by amateur radio hobbyists. Most of these will intercept mobile
- radiotelephone calls without modification by tuning in frequencies in the
- 156 MHz and 475 MHz regions. Most of these scanners have line-level
- audio outputs that can feed a tape recorder or demodulator/tone decoder
- chip which can then interface directly to a computer for analyzing codes.
- Mobile phones use a tone-pulse dialing protocol that should be simple to decode
- and emulate using standard handheld ham radio gear. You can almost count
- the dialing beeps without any special equipment. Phone channels are easy to
- find: they usually broadcast a standard busy signal or an idle tone
- (a fixed audio sine wave) when waiting for the next call. You will also hear
- conversations, ringing, and mobile phone operators on these channels.
-
- Here's a partial list of frequencies used by mobile phones:
- (frequencies in MHz)
-
- 152.51 154.57 152.66 152.69 152.72 152.78 154.54
- 475.45 475.475 475.55 475.6 475.8 475.825 475.85 475.9 476.05
-
- As you can see, many of the frequencies are spaced 30KHz or 25KHz apart,
- so there are probably more channels in the gaps at those intervals.
-
- These frequencies were gathered in a few minutes of casual listening using
- an unmodified Radio Shack Pro-2021 scanner in search mode.
-
- SCANNING CELLULAR FREQUENCIES:
-
- Hobby scanners capable of monitoring Cellular Phones are prohibited in the US.
- To save money on the production line, many international scanner manufacturers
- make only one kind of scanning chip which they use in both US and foreign
- models. These chips are capable of scanning in the 800MHz range but this
- feature is diabled by grounding certain pins in the US models.
- Often restoring Cellular scanning functions is merely a matter of cutting
- a circuit trace or removing a single diode from a scanner's printed circuit
- board.
-
- For instance, removing diode 513 from a Radio Shack Pro-2004 Scanner will
- enable the 870MHz Cellular range. Installing diode 510 will increase the
- number of scanning channels from 300 to 400. Installing diode 514 will
- increase the scanning rate from 16 to 20 channels per second.
- These are located on the printed circuit board labeled PC-3.
-
- The Uniden Bearcat 200/205XLT can be modified for Cellular scanning
- by cutting or removing the 10K-ohm resisitor located on the printed circuit
- above the letters "DEN" on the microprocessor chip labeled "UNIDEN UC-1147".
-
- The Regency Electronics MX7000 Scanner reportedly scans Cellular Phones
- without modification.
-
- An additional scanner rumored to be modifiable is the Realistic Pro-32.
-
- Another source of useful radio gear are "Export Only" manufacturers.
- One of these is currently rumored to be offering a handheld cellular phone
- that does it's own routing and has an operating radius of 160 kilometers!
-
- CELLULAR PHONE FREQUENCIES:
- Here are the frequency range assignments for Cellular Telephones:
-
- Repeater Input (Phone transmissions) 825.03 - 844.98 Megahertz
- Repeater Output (Tower transmissions) 870.03 - 889.98 Megahertz
-
- There are 666 Channels. Phones transmit 45 MHz below the corresponding
- Tower channel. The channels are spaced every 30 KHz.
-
- CORDLESS PHONE FREQUENCIES:
- It's also possible to hack the popular cordless phones. These use the 49MHz
- band used by baby monitors and toy FM walkie talkies. Scanners can be used
- to monitor these without modification, and FM handheld transceivers will
- allow 2-way hacking of these frequencies, which some may find amusing.
-
- Channel Handset Transmit Base Transmit
- ------- ---------------- -------------
- 1 49.67 46.61 (frequencies in Megahertz)
- 2 49.845 46.63
- 3 49.86 46.67
- 4 49.77 46.71
- 5 49.875 46.73
- 6 49.83 46.77
- 7 49.89 46.83
- 8 49.93 46.87
- 9 49.99 46.93
- 10 49.97 46.97
-
- Business Update:
- As of January 1989 there are legal maneuvers going on to lift the
- ban on portable phones by traders at the NY Stock Exchange.
-
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- │ The DNA BOX - Striking at the Nucleus of Corporate Communications. │
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- Another file downloaded from: NIRVANAnet(tm)
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- & the Temple of the Screaming Electron Jeff Hunter 510-935-5845
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- New Dork Sublime Demented Pimiento 415-864-DORK
- The Shrine Tom Joseph 408-747-0778
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- "Raw Data for Raw Nerves"
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