I typically upgrade every two years, went from the 3GS to 4S, to 5S and finally the iPhone 6, a couple of months after the 5S.
The bigger screen was very appealing to me. I kept blaming Apple for staying with the 4" for so long. Eventually I got sick of waiting and switched to the Galaxy S4 from my 4S, which was a big mistake. Got the 5S, stayed with it until the iPhone 6 was released.
Now that I've got the larger screen, I don't see much reason to upgrade yet. The 4.7" iPhone 6 is a great size for me personally. I haven't really grown tired of it, either. I've got plenty of storage, a very thin design (although I prefer the looks of the 5S), great camera and decent battery life. It's still plenty fast, too. iOS 9 is a good OS as well, and I'm looking forward to iOS 10 and seeing what it will bring to the table.
I was planning on sticking to my two year upgrade cycle, but the iPhone 7 isn't turning out to be the great upgrade I was expecting it to be, if rumors are anything to go by. May as well wait for some true innovation before getting rid of this phone. The 2017 upgrade seems much more appealing, if the rumors turn out to be correct.
- A new design
- OLED and hopefully at least Full HD!
- Edge to edge display? Curved?
- Reduced bezels?
We'll see I guess!