One of the more intriguing methods of wiretapping the articles discusses is a service by a company called FlexiSPY. It works by covertly installing a program onto the target’s cellphone. Once installed, the spying party can listen to anything going on in the room the target is in by calling the phone. It won’t ring, vibrate, or give any indication that it is transmitting audio data.

Some of the more hack-oriented methods involve tapping into a landline, using special software to record VoIP calls, or buying a wiretapping kit. Of course, countermeasures, are also discussed, but some of the links they provide are a little more informative on the topic of defense against wiretapping.