[8800GT]

Hi looking at a new blackberry 8520 on contract at £15 a month from tmobile. anyway the contract deal is that i get

• 300 minutes Anytime Any network
• 300 texts Anytime Any network
• Unlimited Internet Anytime Any network

it says i get unlimited internet but this phone isnt a 3g phone so how will i get unlimited internet and will it be avalible anywhere ? also when i add the item to the cart it asks me if i want to upgrade to the blackberry unlimited booster what is this does it boost the internet or something ?