
Now there's a better solution: the cell phone jammer. Sure it's been around for a while, but this one is really cool because it's portable and actually works.
Not much bigger than an iPhone, it will silence any cellphone for about 32 feet in all directions. It is able to block the following frequencies: GSM850, EGSM900, DCS1800, PCS1900, CDMA800, WCDMA/CDMA2000, PHS, DECT and 3G.
Even though the battery only lasts for about 1.5 hours, it's long enough to jam most annoying conversations.
Priced at $246 it is rather expensive.
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