
Mobile cell phone interceptors and scanners will allow you to intercept and record (if you buy a separate recorder) mobile phone conversations automatically, at the push of a button or you can program it to intercept pre-determined numbers.
What you use it for is up to you, but please note that listening in on someone else's conversation could be illegal in your country ...therefore, please make sure that you adhere to the laws.
Most countries have tough laws against eavesdropping; so you could get into trouble if you are not authorized to use it.
Scanning and intercepting cell phone conversations require the use of specialized equipment and the top of the range interceptors are usually sold only to government agencies.
They are extremely expensive ($300 000+), but they are also the best and highly sophisticated.
The cell phone scanners and interceptor described on this page are much more affordable, especially if you only plan to use it a few times.
Model AU 206 scanner & AU 208 interceptor
Both models have the ability to intercept and record (you can attach them to any tape or digital recorder) cellular conversations, but the AU 206 only allows random scanning of phone numbers. (AU 206 intercepting range = 5 miles).
It's cheaper than the Au 208 interceptor but you have no control over who you want to listen to.
The AU 208 interceptor allows you to store up to 20 numbers, which will automatically intercept both sides of the conversation once the specific number is activated. (Intercepting range = 10 miles).
Mobile cellular interceptors like the Au 208 make use an A and B system that defines the regions where this interceptor can be used.
More information and prices here
Other listening devices
An alternative to a cell phone scanner is to make use of a Q-phone. It works like a listening bug, because when you call it, you will be able to listen in on background sound, without the other person being aware of it.
The only disadvantage is that you have to give this cellular telephone as a present to someone else or you will arouse suspicion.
Once again, if you want to be listening to phone calls on a scanner by using cell phone scanners, mobile cell phone interceptors or any other listening device, please make sure that you stay within the law.