I use O2, but only for four phones.
Can't fault them at all for service, their range of phones is very poor though.
I love telling these random phone company's that ring up what we pay and they can't get anywhere near it.
Apart from some dick head from 3 who though we should pay more to go with them when we can't get a signal in the office just because 3 is somehow better?
Why would I want a phone that doesn't work in the office?
If he could guarantee shit signal in any pub he'd have a sale.