via Vector Technologies...
"The US Government has a requirement to properly secure any Portable Electronic Device (PED) introduced into classified processing areas...PEDs such as cellular phones, Blackberry devices, laptop computers and PDAs have inherent technical vulnerabilities that are potentially exploitable... without the users’ knowledge. For example, microphones and photographic/video cameras built into many PEDs can be remotely activated... audio and/or visual information near the PED can either be transmitted in real-time or recorded and then transmitted at a later time. PEDs can also... wirelessly probe the surrounding area... in an attempt to connect to or map out any computer network system."
Several companies, including Vector, have come up with some ingenious products. From cell phone box and socks to portable Faraday rooms, there are solutions for every need.
Resources list:
• Parabin
Tip: Turn your gadget entirely off before storing it. Otherwise the phone will try transmitting signals to the cell site using its highest power level, thus depleting your battery quicker than normal.