CNET UK | Pay the remainder of your contract for 4G iPhone 5 on O2 Caribbean Media Vision If you're with O2 and you're planning to get a 4G iPhone 5, you're going to have to pay the remainder of your contract. “Our new 4G Phone Promise means customers who purchase an iPhone 5 then want to change to a 4G phone next year can upgrade ... iPhone 5 on O2 '4G Promise' is an early upgrade, for a price |