My son's iPhone 5s connects to our home wifi a treat. I decided I wanted one, too, but opted for a used 4s. It is in very good condition and I don't think anything is wrong with it. When I activated it, it was still on IoS 6, so - at work and over the work's wifi to which it obviously connected - I upgraded to 8.1. I am now home and it will not connect to our wifi. I googled the problem and came across one solution - resetting network settings - and it did the trick, it seemed, for about a minute, but now it refuses to connect again. What's going one?