My first iPhone had the proximity sensor issue. I traded it for a new unit a couple of days ago, while getting a recommendation from the Apple "genius" that perhaps I should "re-learn how to talk on the phone." Now the new phone is malfunctioning. This appears to be an issue with all phones, or at least a very large percentage. Let's make the PROX issue front-and-center as much as the antenna issue. Apple, FIX THE PROXIMITY SENSOR.