cellphone

[xox_sam_xox]

who dont cellphones work in the basement?

[qapmoc]

Maybe low power radio waves don't pass through solid concrete with steel re-bars and metres of soil/ground very well ??

[PhilBy]

Because they can't receive a signal.

[mibn2cweus]

Cell as in cell phone is short for cellular not cellar.

[tellboy]

This can not really be a serious question can it ?

They do not work on the underground system that is why it is lovely and quiet and no phones ringing.

[fo3nix]

First off, there may be metal shielding somewhere. Cellphones send their data with electromagnetic waves (in the microwave spectrum I believe). For certain reasons that I won't really go into (but basically for a charged object, its charge is on the surface), electromagetic waves cannot pass through into a metal box. This is why you won't get a signal in a lift (elevator you may call it), unless the lift has a receiver inside the lift itself.

If you basement is covered by a layer of metal above, then the signals will have a hard time getting through.

Like everything however, they do lose energy. Going through thick things takes more energy than less dense things (its harder for you to swim through treacle than water); so getting through a lot of thick brick/stone (which your basement may have) can also be a challenge for it.

[qapmoc]

tellboy, I am sorry to upset you but LT is considering to install antenna systems in the tunnels so that cellphones can be used on the underground.

[jimmyb01]

Already installed on some lines on LUL just waiting for a switch on date. Looks like late next year.