This is why I never took the full plunge into the apple world, I still did buy some pricy apps, one of my dumb mistakes was a month before switching platforms I bought the navionics app on the iphone, what a joke on such a tiny screen. The brighter side is I could buy a ipad later on and use all the apps on there.
I never upgraded, it's looked like phone a child would play with.
Far as apps, I ran my iphone hard and would crash apps plenty of times, that was just how i used it though, not a common problem