Comment by klodolph

People upgrade because what they have becomes worse as time goes on. Maybe you don't get OS updates any more and you can't run apps you want, maybe you do get OS updates and your phone is now slower. Maybe your battery charge lasts less than a day and you don't know you can replace your battery or don't want to. Some people I know almost always end up with cracked screens and upgrade rather than repair, and some other people play Ingress or Pokemon Go so heavily that their batteries don't even last a full day.