We turn off the whole house at the fuse box, it's lovely actually. I'm still using my phone right now, but the quiet is divine, and I wouldn't be using it if the kids were around.
We made £12.60 on the two hour session and are at somewhere around £40 in total so far from the sessions they've done. One hour pays for about a day and a half of our usage, so it's massively worth it.