I don't change my phone.
How true...I'm still on my Blackberry Q10, and before that, was on a Palm Treo, and before that, Samsung N400 and that's my life history of my cell phone usage. Of course I'm leaving out employment provided/on-call cell phones.
This whole planned obsolesce marketing strategy is becoming overkill when it comes to cell phones, especially with the frequency of new models being upgraded. I find it completely fascinating how the "sheep" fall into line with this marketing ploy.
I have been saying for years, that I don't want a phone that won't allow me to have a user replaceable battery and/or memory card. I would also say the same about the charger, but over the past several years, it has become less of a hassle as most manufacturers they have started to use standardized USB type connections.
So like the original post, no need to upgrade until *I* need to upgrade. And my upgrade schedule doesn't even come close to the marketing's recommended upgrade schedule.