[metrokoi]

I wonder if there would be a market for actual electromagnetic shielding products, such as some sort of conductive paint for walls and ceilings? Of course, you could not use your phone or other devices, but it could be useful for the bedroom. A good way to have a guaranteed "do-not-disturb" zone as well!

[AstralStorm]

The market is there, schools would love this technology. The problem is that simple thin coat of aluminized paint is super expensive, as is a big mesh. And phones are very effective at getting the low signals through any available hole in filter coverage.

[JPLeRouzic]

I wonder if it would be possible to install a 4G network extender [0] then implement IP route rules on the ADSL router, to forbid access to Facebook and co?

[0] https://www.verizon.com/support/4g-lte-network-extender-faqs...

[rosswilson]

Those extenders typically backhaul the traffic over a VPN back to the telco, so your router would never see the true destination (e.g. Facebook).

[cskinner]

And will ramp their transmit power up to do so.

[mekkkkkk]

AFAIK this already exists. It's used for segmenting frequency ranges in places with a lot of wireless pollution. For example; if you have a large building with a ton of access points and networks you might want to limit the interference by stopping certain frequencies going through select floors or walls.

[pjc50]

Then you discover how hard it is to get a really good shield. Walls and ceilings? Maybe you lose one "bar" of reception. You need the doors and windows as well.

[AstralStorm]

Also a guaranteed way to be unable to call emergency. You better have a stationary wired phone line in there.

[metrokoi]

Of course. Although if one couldn't walk/crawl a few feet out of a bedroom for an emergency, they are probably unconscious or have a very large bedroom. I'm assuming the marketed consumer would have minimal usage of a cell phone anyway if they are concerned about electromagnetic radiation.

[AstralStorm]

I was thinking more of a whole living space. It's actually not that bad if you have a phone within a walking distance and the area is safe.

But then it's more about self discipline. You can always shut down the devices yourself instead of relying on a curtain measure for that which might prove annoying.