this is not for everyone. i just upgraded and three now do a two year warranty on all there mobiles including iphone. there website says its not. but customer service will confirm. also there is an automatic £10 discount for upgrade customers against the website prices £20 and over. customer services will tell there is not. stand your ground and get transferred to the retention team. some inside information the retention team will also remove £99 upfront costs on the iphone 6 16gig and still get the £10 monthly sadly they will not do it on 64gig and above.
new customers can do the deal as long as customer services transfer you to the uk based teamhttp://www.three.co.uk/Contact_us/Phone_Pay_monthly?intid=contactpaym