nope, they dont want your old phone, if you want to cancel, pay the rest of the contract off, so ur current tariff x remaining months. so you paying for something that you could be using if you cancel. just unlock the iphone and get a data bundle. vodafone is giving it to me for free and they givin me the £45 iphone plan on vodafone for £30, coz my contract is over but i love the service i get, oh and they are going to insure my iphone so if anything happens ill be alright. all that, only if i stay with them, and because i've only had vodafone from the get go.