Take a cursory look at any carrier's online store, or a big electronics retailer, and you will see you can pick up a brand new 6S for about £299. This isn't old stock, either. Apple are still manufacturing and selling these phones new. This is how Apple targets and reaches the lowest end of smartphone buyers, and I think there's a strong argument that the 6S is in a lot of ways better than the androids you can pick up for similar amounts of money (near flagship grade performance for just one). The 6s will be getting at least another 15 months OS support, and App support should last a good year, two, three even after OS support ends. You get all the benefits of iOS 13, Apple's ecosystem, you're giving up very little in reality aside from a few bells and whistles on newer models. For people looking for a basic, great smartphone experience this is still an excellent option.