I had a 3GS which I kept until it stopped working reliably. I then got a 6 which is still going fine (after a new battery, I think the 3GS had 3 batteries in the end) and which I'll keep until it starts causing problems. I think these work out pretty well in terms of pounds per year for phones that I find easy to use and do everything I ask of them. I do know people who change phones every year. That, to my mind, is what is stupid, whether they are constantly upgrading iPhones, Samsungs, or even cheapo android.