Why you shouldn't trust cell phones

I saw this link today on one of the security lists I monitor. For a mere $1,800 you can own a modified Nokia cell phone that will appear to be turned off, but will in reality accept incoming calls from a number you specify, and turn on the speaker without giving any indication that the phone has been turned into a stealthy bugging device.

The same email also included this link, which has information about an Israeli company selling devices to alert you to just such an occurrence.