Anyone who has listened in on cellular phone calls with a scanner or using the test mode of their cellular phone will have noticed a call suddenly dissappearing, after a short chirp. What is happening is the call has been moved to another channel. That chirp is a control message sent by the cell tower to the mobile phone telling it what channel to go to. All phones have built in hardware to decode this, and it is available in test mode in a great number of them. Here's how to decode this using a Motorola phone.
Here's the program that someone compiled for MS-DOS.
Or, you can do it the old-fashioned way, by hand:
This hack assumes you can:
1. put your MOTOROLA phone into test mode.
2. unmute audio (08#)
3. load channel numbers until you find something worth listening to. (11XXX#, where XXX is channel number)
Problem: When listening to something interesting (a conversation), just when that sexy sounding horny broad begins to give her phone number to some lucky guy, HANDOFF!!! then static... DAMN! Trick: Hack the FOVC. a quick definition: FOVC = FOward Voice Channel FOCC = FOward Control Channel REVC = REverse Voice Channel RECC = REverse Control Channel As the phone travels through cells, the FOVC is where the tower tells the phone to adjust power levels for the current cell or to change to a new channel for use in the new cell. This info can be hacked apart. So. When you've found a good conversation, don't be lazy! Enter 40#! This makes the phone listen for commands on the voice channel (embedded in the audio portion- you can hear it as a "bump" sound). It will just sit there and the display will read '40' , but the conversation will still be audible. Now when the phone receives a FOVC command (a 40 bit sequence) data will flow across the display, in hex format, and stop. Listen to the phone, if the conversation is still there, then the command was only to adjust power levels. If the conversation is gone, then its a handoff. If you only got a power adjustment command just press # or clr, which ever gets you back to the ' prompt. Enter 40# and keep listening. You can also use the # key to cancel the 40# command, if you want to change channels or something. If it was a handoff, its time for some quick math. You have to convert some of the numbers to binary, and then to decimal. I don't know how many characters your phone's display will show. Mine only shows the last seven of the ten hex digits. Count left from the end 6 digits. Write down that digit and the next two on a piece of paper, ie: ???j16djjj j=junk numbers (hex numbers range from 0-9,a-f) / \ these are lost due to scrolling write down 16d then convert it to a binary string: 1 = 0001 6 = 0110 d = 1101 (d=13) now you have a binary string like this: 000101101101 throw away the first 2 bits and get: 0101101101 convert this to decimal and get: 365 365 is the new channel the conversation has moved to! Enter 110365# and voila! You too, can hear the horny babe's phone number! Don't forget to enter 40# again, as the call may be moving quickly through cells ( small cells or freeway driving ) or the call can get bounced around by the tower for cell traffic purposes. Here's one more example of the hex>binary>decimal conversion. ???j5aejjj 5 = 0101 a = 1010 e = 1110 full string = 010110101110 truncate 2 msb = 0110101110 convert to decimal = 430 That's all for today! Anybody having similar hacks, please post! Also, if anyone can help with the following questions, THANK YOU!!! 1. What are the pinouts and specs on the MOTOROLA FLIP phone data jack? 2. I know that three of the pins are a "proprietary" data bus. This comes from a tech at motorola. HOW DOES THIS BUS WORK??? 3. When loading channels into the synthesizer with 11xxxx#, the phone goes to a preset frequency for receiving and a different frequency (45 khz lower?) for transmitting. Can the frequency table be shifted to allow a phone in test mode to RECEIVE the REVERSE channels instead of only the foward channels??? ********* attn FLAMERS: MAKE HACK, NOT FLAME.... *********** ********** Life is short, HACK HARD! ******** ****** JUST HACK IT ******