I have a 3G, so I don’t have that problem either. Never had a buttdial or a facehangup.
iPhone 4 user, no problems with facehangups.
Hitting the little button on top of the phone while in a call on an iPhone hangs up the call.
I have a brand-new smartphone, an LG Ally, and it’s virtually impossible to ass-dial! (With my old “dumb” phone, I frequently took pictures of the inside of my pocket. Most of the buttons were inside, but the camera button was outside.) I have the auto-lock set to one minute. To unlock, you have to first slide out the keyboard, then do the unlock slide on the touchscreen. That sequence is not going to happen inadvertently in my pocket.
I haven’t hung up on anyone by my cheek touching the screen, but I have pressed unintended touchscreen “buttons” in voicemail playback that way. As best as I can tell, my phone doesn’t disable the touchscreen, which I wouldn’t want it to anyway with all the “press 1 for this, press 2 for that…” involved in voicemail.
iPhone 4 user checking in; the initial release of iOS 4 didn’t play well with the proximity sensor in the iPhone 4 – there were some wonky results and random trippings of the sensor. Since the multiple software updates since then, everything has worked fine with it, IME.
Me neither. ‘course, mine’s in my purse… 