There comes a time in my experience where every iPhone I have had gets to a point where the latest update cripples the phone. It goes from snappy to painful. I have a 7 and I don't want it to get slow and frustrating. Should I stop updating now, or is there some predictable point when you stop updating? Are updates unstoppable? I'm completely happy with my 7 after upgrading from a 5s and I want it to stay exactly the way it is now.