Cell phone eavesdropping is illegal, but it's pretty simple to do. Using a Bluetooth headset is one of the easiest ways to eavesdrop on another's conversation. Sometimes, you'll have to use an antenna hooked to your computer. Some say you can turn on the microwave, and listen in on cell phone calls in your area. A CB radio can also be used to eavesdrop with, if you can get it set to the same
. frequency as the cell phone. More information can be found at http://www.ehow.com/how_2316214_eavesdrop-cell-phone.html.