It's an iPhone 3GS 32gb that is only a few months old and has always been kept in a protective case, and has never been dropped or exposed to water. Today it suddenly started operating much slower than normal and is unresponsive to touch. I can't make any calls because it won't "read" anything I type in.
What could have caused this, and what can I do to repair it?
What could have caused this, and what can I do to repair it?