They're waiting to see what each other does in my view. Don't forget there are 6 networks in competition now, so price is crucial.
*ding* we have a winner!
No-one really wants to blink first here, especially considering the rage that was thrown at O2 for capping data. Three and T-mobile may be waiting on allocations I guess considering they came late to the party but I'd be amazed if O2, Orange and Vodafone don't know exactly how many units they're getting (although I guess they may be working out on-line v in-store allocations internally). It's that all important price that's killer, especially when they can all react so very quickly these days. Once someone breaks and publishes figures they'll all follow on I'm sure.