Do you want an iPhone but don't like O2?

Do you want an iPhone but don't like O2? Maybe you experienced their recent system downtime abroad or have had the misfortune to use their dire "customer service". There seems to be a solution for O2 phobic iPhone users; rumours abound that T-Mobile will offer iPhones to high spending customers who threaten to leave for another network. Allegedly there are 150 iPhones per week available, I presume the iPhones have been purchased outside of the UK for resale.

As an O2 user I am not sure if I would swap to T-Mobile, a network whose building penetration sometimes seems to be measurable in inches rather than feet.