Looking for more info regarding this problem..
Purchased iPhone 4 for my wife and I last month.
My iPhone ear-speaker went dead, but the external speaker, plug-in wired ear-phones work, and mic still work.
I went to take it in, and then the darn thing started working again. lol Same thing happened early this week - not working, then it started working again.
Now my wife's iPhone 4 is starting to do the same thing. argh!
Not really sure if it's hardware or software.. but anyone else on this forum experiencing this same problem?