No sound , Can't hear my caller after I remove my iphone headphones.
For information purposes only, I did a search with no sound, headsets and so on and it was to difficult to find a thread. Hopefully this will help.
The gist of it is cycle your headset or audio cable in and out a few or more times to get your sound back.
This is not a fix for the no sound and no sim issue.
Headset sound works fine.
No lock or unlock sound, No iPod sound, sporadic NES sound, No call sound, and basically no system sounds except ringer.