If you have a problem with your cellphone making an annoying tkkttktktk sound come out your speakers, this Instructable says wrap it aluminum foil. Doing so should prevent the EMF gremlins from escaping and wrecking havoc on your audio equipment.
There’s also the added benefit that now the CIA won’t be able to read your thoughts through your phone. — BEN POPKEN
how to block annoying cell phone interference [instructables]
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UPDATE: Or not. Commenters say this idea is stupid. Maybe you can use the foil to wrap your fake fake [sic] eggs.