What does 'subject to a fair use policy' mean?

I'm wanting to buy the Blackberry Pearl on play.com and it's telling me I can get it on pay as you go with unlimited internet and emails. But in brackets it says (subject to a fair use policy). It's on T Mobile and their deal is free internet for a year, is this product misleading me and going to take... show more I'm wanting to buy the Blackberry Pearl on play.com and it's telling me I can get it on pay as you go with unlimited internet and emails. But in brackets it says (subject to a fair use policy). It's on T Mobile and their deal is free internet for a year, is this product misleading me and going to take the free internet advantage off me after a year?
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