You do realise that unlimited plans are very unusual here in Europe as well ? In the UK only one of the four main providers (3) do unlimited plans, the rest (O2, Vodafone & T-Mobile/Orange) all have limited data usage plans now.
Germany: Telekom (owner of T-Mobile) - iPhone with unlimited data plan, Vodafone - unlimited with different throttle steps depending on price, e-plus - same as Vodaphone...
Now, that is Germany only. I admit, I'm too lazy to check France, Switzerland, Austria, etc. The point is that in countries where you have no unlimited data plan, you just get ripped off. So, congratulations to the UK, and welcome to the ripp-off!