Interesting link in terms of tempest paranoia:

http://www.erikyyy.de/tempest/

DIY (collaborative) tempest emissions.

if you're feeling like a profiteer why don't you just start selling a faraday cage phone case

The real money is probably in building faraday rooms.

You're right, there's lots of money being made by contractors in the faraday-room business: http://en.wikipedia.org/wiki/Sensitive_Compartmented_Informa...

A Faraday box might be more fun for higher trust environments. Starting your staff meeting? Family dinner? Watching a movie? Everyone puts their phone in the Faraday box and they get it when it's over. Similar to "The Phone Stack" game, but enforced. A nicely designed box in bright colors with a padded, felt-lined interior with separators (or even chargers).

If you leave your phone on and put it in a faraday cage, the battery will drain at the maximum rate as the phone goes into "find a tower" mode which is basically to broadcast at maximum power over and over trying to make contact with any towers that might be within its maximum range.

Isn't this only the case for a CDMA network? Thought GSM didn't have this characteristic.

Phone won't work inside the case?

exactly. the slogan is "It's a phone when you want it, not a bug when you don't!"

Looks like it's already in the works guys: http://offpocket.com/

You could have a whole product line. E.g. Copper mesh lined laptop sleeves.

Sewn into pants...