So, I'm going to Warwick to study. I've got a BB Curve 8900 unlocked. I'm looking for the best plan that I can get for it. There's a system of contract I believe in the UK? Not sure how it works. Anyways, I want a plan to enable me to use BBM, Email as well as Internet. Looking for good interntional calling rates, and good calling rates to London. What would be the best plan?