Hi, Please can anyone help! I have unlocked iphone version 1.1.1 What I need to know is - If I put a contract sim in iphone with unlimited data or what ever it may be,either on vodaphone or o2 will I be able to use this data allowance etc as I would if it were in the phone I first took contract out with ? Also if it were an o2 contract would visual voicemail work ? I have been told very conflicting advice on all these question.😕Any advice much appreciated.Thanks.