… and you will have no idea …

Schneier on Security: Remotely Eavesdropping on Cell Phone Microphones The U.S. Commerce Department’s security office warns that “a cellular telephone can be turned into a microphone and transmitter for the purpose of listening to conversations in the vicinity of the phone.” An article in the Financial Times last year said mobile providers can “remotely install a piece of software on to any handset, without the owner’s knowledge, which will activate the microphone even when its owner is not making a call.”

Nextel and Samsung handsets and the Motorola Razr are especially vulnerable to software downloads that activate their microphones, said James Atkinson, a counter-surveillance consultant who has worked closely with government agencies. “They can be remotely accessed and made to transmit room audio all the time,” he said. “You can do that without having physical access to the phone.”