Found 18th Oct 2015
Iphone 6s 64gb on a 24 month plan (vodafone) through carphone warehouse - unlimited minutes, texts and 6gb of data for £35 per month with a £150 upfront fee. Potential for £80 quidco. Total minus cashback is £910 over 24 months. Bearing in mind the phone is £619 to purchase outright - minutes texts and data only work out to be a touch over £12 a month.