Good luck if you're switching to O2
The company I work for switched from Orange to O2 just under four years ago. O2 is great provided you're in the greater London area... the second you're outside the area its horrendous. I have no service in all but one room at home and when I'm at the in-laws i have to go up to the third floor bedroom to get a signal strong enough to make or receive a phone call.
O2 won't sell me anything equivalent to Vodafones sure signal device and their TuGo service isn't available to business customers. Had an argument with them on twitter about just this a few weeks ago.
My Mrs recently switched from O2 to EE and she gets brilliant service on any BlackBerry or Android phone. The second she switches to her iPhone 5s she starts having issues. She can have 4G signal with good data transfer with her Blackberry... switch to her iPhone and battles to maintain a 3G connection long enough to do anything.
I've got a Three data plan as well and that is by far the best... I get better download speeds on that than I do using my home broadband connection. I'm actually in the process of getting rid of my BT Broadband subscription in favour of my Three data plan.
Biting the hand that feeds IT
