I know about Super User, but from all indications it is all about computer hardware.
Is there any Stack Exchange site where I can ask questions about problems on my phone?
Meta Stack Exchange is a question and answer site for meta-discussion of the Stack Exchange family of Q&A websites. It only takes a minute to sign up.Sign up to join this community
The existing StackExchange sites get much more attention than the Area51 proposals, so if your question fits anywhere on SE, post it there. For example, there is Android.SE or Apple.SE (fine for iPhone questions; also gets much attention) or Windows phone.SE.