im going to buy an iphone from my friend but heres the deal. im currently on a contract with O2 where i get 1000 minutes and unlimited texts for £30 a month. If i go ahead and buy this iphone will i need to buy anything extra in order to make the iphone work with this sim card. Also will i have any complications when i buy the iphone as ive heard that sometimes you have to "activate" the iphone with the contract. Im new to the iphone world as you can probably tell!!!