on my new iphone 4 I had about 5 or 6 instances yesterday where I was on a call and then my face accidentally was pressing buttons on the screen. twice my face decided to call a couple of my friends. Once it decided to call my voicemail. and a few other times it just wanted to go to the keypad and start just randomly pressing buttons. Oh yeah and also it created a contact with the name "yh" My face sure is busy when it's supposed to just be having a conversation! I never had this issue with my 3G. This can only lead to 3 possibilities. the proximity sensor doesn't always work properly, the sensor is in a different location that I'm not used to, or the screen is still activated even while darkened. I have tried testing these things for about 5 minutes on a call and everything seems to be working perfectly under my evaluation. Has anybody else had any issues?