Same here !
Hi there,
I had the same problem, my phone would only vibrate and not make any sound on things like typing a message, and when I got a call or a text.
The strange thing is that is I switched the phone off then on again it would all work ok, I noticed this on Friday and over the weekend, I called Apple Support who did not have a clue about what to do, strange that it has been fine yesterday and today.
Its not just you, if you look at other forums on both here and the apple communities pages others are having the same issue.
Hope that helps.