Hi guys. I've had a 4 for a little while now and I've noticed the button are pressed by my ear while I'm having a conversation. I'm not sure but I thought the 3Gs screen I had before this one turned off sooner. It never had buttons pressed accidentally while I was using the fone. So while on a call, I'll here dtmf's or the speaker will turn on or the mic will mute. The screen seem to stay on for most of the cll which is why the buttons are available to be pressed. Has anyone got a suggestion? Or is this something I have simply not noticed for the lasyt 18 months? I have to use the headset (bang and olufsen headphones are fabulous by the way) or somethig goes wrong during the calls. I'd really welcome any feedback others may have. Thanks so much for reading.