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You don't need to pry out the black box. You can just buy a portable jammer

Use a cell-phone jammer! This one works well in Canada, and I'm sure it'd be easy to find one on dealextreme for much cheaper.
 
Sure, it's ALSO insensitive and barbaric, but if you use it to stop others from annoying the entire area, you're actually doing everyone else a favour.

This device has not been authorized as required by the rules of the FCC. This device is not, and may not, be offered for sale or lease, or sold or leased, until authorization is obtained.

Yeah, not like you can't just go and buy one anyway.

Wait. So you're saying this is illegal to buy in the US? I have not seen or heard of such a law.

I know a number of people who ride the commuter trains, and more and more of them are starting to carry these handy little devices. No, no one cares about how legal these are or are not. Turn them on just long enough for the offending phone to lose the call, and they are undetectable.

Voila

Much easier (and cheaper) with one of these little things http://www.phonejammer.com/.

Or just buy a few of these and install them:
http://www.phonejammer.com/

Pay some kid to walk around the place and sit in every seat with a cellphone from carrier to see if they still get signal.

Much easier than putting a copper mesh over the entire theater and worrying about holes.

Favorite jammer sources:

GlobalGadget
GrandTrades
PhoneJammer
Starport

Build Your Own!

This is already being worked on. In Canada, for example. You can buy jammers. Here [theregister.co.uk] and here [theregister.co.uk] are two articles with more info.