Buy several new ones each year....Last years models go to the kids, the others get sold or I hold them until the model is no longer sold.... go in for OOW replacement and pay the extra for the newer model.
Every couple of years. This year I'm going for the iPhone 6s Plus
I want to do it every year, of course, but then I realize I can push a bit more time out of my current device, even if it is a 5s with a tiny 4" display.
When I feel like it, but my last three iPhones on launch day. Skip the S models though because the upgrade is not normally significant enough for me.
However to the OP, why are you concerned when I upgrade? We are all at a different position in our life. I'm fortunate enough to be able to buy what I want when I want, others more or less so. But who cares? Just buy a phone when you want to not when you think you should.
With phones and computers, I typically use them until they become slow, glitchy, new software is not available, etc. So I am still using my iPhone 4 (yes, not even a 4S), which is over 4 years old now. I am planning to buy an iPhone 6 next month.
Every two years. I think it strikes a nice balance between always having a fairly recent phone and upgrading often without breaking the bank.
My laptop is in its fifth year now, so that'll probably be upgraded this year along with buying an Apple Watch. I already essentially have a direct pipeline from my bank account to Apple's, I don't need to increase that by upgrading my phone every year too
Had my original iPhone up until iPhone 4, then had each phone each year. This year though I think I'm sticking with the 6+ for the time being. Not getting the next one, ill have to see what the one after is like. I used to hand down the last model to my S/O, but this year she got a 6 and me a 6+.
She's the type though that would use a phone until it couldn't be used anymore.
2 years but right now im on the third year on my galaxy s3, iphone 6 didn't convinced me, then i waited for galaxy s6, now they are saying both battery lifes are pretty similar...sigh. Makes me wonder if i should wait for the iphone 6s now..
Pretty much every two years. Went from the 3GS to the 4S, to the 5S and now the iPhone 6. I will most likely keep this phone until the iPhone 7 comes out.