Is there a limit on data on a Unlimited Internet contract with T-Mobile in the UK?

It says it in the question. Pretty much I want to get the new iPhone 5 as soon as it comes out, so I guess the prices will be similar to the most expensive iPhone 4S ones now. In a 36pound/month contract, the "Full Monty", it gives "Unlimited internet including teathering". I'm not sure whether it's going to be actually unlimited, so all the YouTube I want on my laptop, or whether there's a limit after which it either costs to surf or the speed is reduced from let's say 4G down to UMTS standart.

Any help appriciated.

No. Tmobile just launched truely unlimited Data (google it)… No more 5GB cap or 5GB throttling (slow down speed after 5GB)… None of that garbage… True unlimited data, just like Sprint.

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