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Aluminum foil works. At least, I can’t receive calls or texts through it last I tried.
Get the heavy duty kind. It’s not any more conductive, but is more durable against tearing.
Note that a gap in your phone’s tracking data can look suspicious at times. Sometimes it’s less suspicious to leave your phone at home.
I second this. I’ve seen videos of cell phone thieves getting caught and they all have rolls of aluminum foil on them. I trust they know how to effectively block wireless signals.