I've only ever had one iPhone and the reason I decided I'd never get another is that it slowed down unacceptably when a new OS version came out. Every phone I'

I've only ever had one iPhone and the reason I decided I'd never get another is that it slowed down unacceptably when a new OS version came out. Every phone I've had since then I've switched from on my own schedule, never forced to by slowness like my one iPhone.