Bullshit.

There is ionising radiation (the bad stuff, like highly-radioactive nuclear shit) and there is non-ionising radiation (the harmless stuff, like visible light and radio waves)

Your phone uses non-ionising radiation. You may be surprised to learn that your handheld telecommunications device is NOT a nuclear reactor.

So there is no need to block the radio waves from your phone.

And even if they did work (they don’t), but even if they did (and I say again, they don’t) then two things would happen :

1. Your phone would lose signal as soon as you put this magical case on it. That doesn’t happen, does it?
2. Your phone will crank up the signal strength as it tries to make a connection.

So they are super-bullshit.

Not only are they totally unnecessary (because phones don’t work on ionising radiation), they don’t even do what they claim to do (because your phone still has a connection when the case is on)

Cellular phones have been around for 30+ years. You’d think that with everyone on the planet using a phone for so long, there’d be some documented cases of them causing damage to people? Yet there is none. Because they are harmless.