In my particular case, the phone searched for available networks, so I didn't have to type the name in, but changing to the non-guest version solved the problem. I just thought gthat the original poster might be running in to the same issue. I find wifi routers can be a pain. I bought one about nine months ago and it would never quite work properly. I had to reset it almost every time I wanted to connect the laptop or phone to it. Occasionally it would be fine, and at other times, it would throw me out very few minutes. It might just have been a setting, but I tried all sorts of things and nothing would work. In the end, I just bought another router, and that is working beautifully (now that I know not to use the guest account!).
