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this post was submitted on 04 Apr 2025
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I've tested some and they work good if properly wrapped shut, but probably better for day-to-day use and less for such an event where you'd probably be best just to leave it home. Phones use radio frequencies from 14MHz (NFC) to 39GHz (5G mmWave) with spec up to 71GHz. It is real hard to get a radio wave blocker bag that can block almost every conceivable frequency band in the RF spectrum.
It is also hard to truly turn phones off anymore, many broadcast Bluetooth beacons when powered off, and even outside of that, they leave dead-reckoning tracking turned on that can extrapolate where you may have gone just by how you walk. It is also why a phone turned off can still have a dead battery in a month or two, because stuff is kept running, when older phones truly turned off and you could pick it up a year later and still have a charge.
EE here - a well sealed foil pouch should work just fine for basically all RF radiation. Even at a few MHz a piece of heavy duty aluminum foil has like 150dB of attenuation, and that goes up to basically infinity above 1GHz.
Yea just use your trusty hat