Wednesday, February 23, 2011

CrazyEngineers Forum - Electrical & Electronics Engineering

CrazyEngineers Forum - Electrical & Electronics Engineering

General Question about processing cellular phone signals

Posted: 21 Feb 2011 06:16 PM PST

I have seen phone scanners on the web, I am not interested in that, but it does fall around what I am interested in.

I am sure it's possible to listen on 900 MHz and grab the cell phones transmitting their signals. Now each cell phone carrier operates in a range of frequencies and the phones transmit on those frequencies. The tower gets the signal and demodulates the signal.

The question is this, when the signal is demodulated there must be some way to distinguish each individual cell phone, well otherwise it would be chaos. I believe the it something to do with the ESN or sim card. So I imagine the unique id of each phone is transmitted in the signal and not encrypted or encoded or anything like that. Is this true?

thanks,
kevin
Posted by at

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)