Hi all, I thought this might be useful to some of you that are having major problems with the proximity sensor issue with the iPhone 4. Here are two ways to get around this without doing any software changes. First, before making or receiving a call, plug in your headphones or mini speaker cable (this also will work with a mini speaker adapter). Once you are connected, simply press the power button and then unplug your headphones. This will put your iPhone 4 in locked mode. That's it, no more pressing buttons with your face.