They tested this one on Mythbusters. With an old unshielded communications system and the right kind of cell phone, the system went completely haywire. With a modern electronically shielded system, they couldn't affect it no matter how much they tried.
Also, 'noise cancelling' headphones won't help with blocking out someone on a cell phone, because they only remove the constant sounds like engines or air conditioners. You want in-ear 'noise blocking' earphones.
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