Electronic devices in planes: 3 questions.

[J B L]

1. Mobile: I fly probably 3/4 times per month and sometimes forget to switch the Blackberry off, other times it switched itself back on as I throw it into my bag before putting it in the overhead locker. Not often but it has happened. Now if I do it, I can imagine that others do too, how does it affect the plane's systems?

2. Kindle: as I understand, it only uses power when I change page and so little that it's probably as much as a watch. Why do I have to switch it off.

3. Airlines discrepancies: I never have to switch anything off when flying with Swiss. Why is that?

No great inconveniences but just wondering for general knowledge.

[J B L]

Kindle only got Wifi and it's always switched off unless downloading books from home.

I thought large passenger aircrafts had some sort of gizmo to counter mobile phones interference (may have read it here a while ago).