Sleep/Wake Button Now Ends Calls?

I have not seen this problem. I agree, locking the phone while in a call should not end the session.

It does indeed end the call if I'm not on a headset, but if I am using a headset, it doesn't end it. I personally think this is awesome! I now have a physical end call button!

My 3GS did that as well.

Apparently this is a known issue with the new iPhone. The auto proximity sensor was meant to take the place of manually being able to lock your phone. Either the sensor itself is faulty or the software behind it is. You can still lock your phone while using a hands free device as earlier stated. However if you have been "face dialing" more than you've been "face timing" I would talk to apple while you're still under warranty. Also I completely fail to see the usefulness of a physical end call button. Were you planning on leaving the phone on the side of your head?

I also miss this function of physically locking my screen. for whatever reason, I may not be holding the phone snuggly to my ear i suppose so that it automatically locks the screen, most my conversations are interrupted with dial tones or accidental end calls. If you guys figure out a way to restore the locking feature while on a handset call, please let us know. thanks much.
Alex

This is so anoying. Nearly all my phone calls have been interupted due to me accidently hitting buttons due to not holding the phone completly flat on my head. If any one knows how to change the sleep/wake button back to the old function please let us know.

I'm having the same problem. I can't have a call without hitting the phone menu buttons unless I hit the home button after I dial. Then my faces just does other less disruptive things on the main menu.