[peter200285 (OP)]

I want to make device through which i can catch the voice signals of mobile phones near by me, may be by doing some change in walkie talkie or in cell phone. Any idea?

[RD]

https://en.wikipedia.org/wiki/IMSI-catcher

http://pcworld.about.net/news/Apr142005id120407.htm

This is a wireless equivalent of wiretapping which is criminal offence in many countries.

[peter200285 (OP)]

Thanks but did you know any method through which i can made this device myself?
And do not worry about laws, i know and respect all laws.

[RD]

Thanks but did you know any method through which i can made this device myself?
And do not worry about laws, i know and respect all laws.

If you know "all laws" you can become a highly paid lawyer, then you could afford buy such a device. [ However you could then lose your licence to practice law by using such a device, if it is a criminal offence to do so in your country ].

[imatfaal]

Agree with RD - we cannot/will not give out practical advice to build a device for which it is difficult to envisage a legitimate use.  Unless this thread takes a very theoretical turn, ie  away from actual building then we will reluctantly have to lock it.   

[peter200285 (OP)]

Ok i understand what you people trying to say, I am closing this discussion.