Using t-mobile internet abroad?

I'm going to Spain at the end of the week and I want to use the internet on my phone while I'm there, I've been looking at the internet boosters and wondered how much internet 50mb is? I have an iPhone and I use it for the internet a lot especially Facebook, Twitter and Youtube if that helps.

Added (1). I found the prices of the boosters but what I want to know is how much usage I'll get if I buy the 50mb of internet.

So for spain, which is in europe, 10mb of abroad data will be £2.08, 50mb will be £8.33 and 200 mb will be £29.17

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