well...the iPhone will work but not the SIM card..
iPhones are widely used in the UK.
Approximately 10 million
No, it wont work. But if you bring a UK or an American phone to Asia it will work fine.
You should have no problem using an American iPod Touch in the UK.
They will work, but you will need a plug adaptor.
No they will not
Yes stupid, ther work everywhere
iPhones need a SIM card to work as a phone. If you don't have a SIM card you can use it as an iTouch.