The iPhone 17 costs £795.00 new compared with £114.99 refurbished (no longer sold new) for the iPhone 12. Buying the iPhone 17 refurbished instead of new saves £236.00. If you want Apple Intelligence support, USB-C charging and a larger 6.3" screen, the iPhone 17 is the better choice. If value is your priority, the iPhone 12 offers the stronger buy at a lower price point.