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how to detect GSM Jammers?

Dear experts

i want to detect GSM mobile phone jammers when being around or activated.
any product or schematics ?

Thanks a lot.
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3 Solutions
Here is a huge product with ALOT of more features, goto Page 245 for Jammer detection part:
Phone jammer detector

           What is a Phone Jammer?            
A phone jammer totally paralyses, rendering inoperative, all kinds of mobile                  and portable phones working in the GSM bands.             The solution: Phone jammer detector            
The unique, embedded Jamming Detect & Report feature allows all our GSM modules to detect the presence of a disturbing device such as a phone jammer and gives a hardware and software indication of the event.            

How does the phone jammer detection work?            
Any GSM module / phone registers to one base station but will also "see" a lot of other neighbouring cells as well. With our embedded detector you can detect a jammer by noise level and the number of disturbed neighbouring cells. If the GSM module detects a jammer then it will set the GPIO hardware output pin from LOW to HIGH and also send the message "JAMMED" to the serial port. This is all controlled by inbuilt AT commands. The micro controller on PCB can detect the output pin or the message ”Jammed” on UART and then switch on the horn and/or lights of the car.
Source http://www.gsm-modem.de/phone-jammer.html

This type of jamming detection is supported by all GSM modules listed here:

I wish you a fast start with your wireless application.

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