I am going to seriously consider unjailbreaking my iPhone 4 if a fix comes out and I am continuously having problems with the proximity sensor. I just got my 4 last week and didn't have any problems with the sensor until yesterday when I hung up and dialed another contact 3 times in the span of 5 minutes. That was extremely annoying. If it continues and a fix comes out, I'll be very tempted. Primarily I use MyWi, SBSettings and a few other tweaks. If AT&T had a less expensive tethering plan I'd probably do it in a heart beat. Anyone else going through similar pains and are considering an iOS update knowing it would mean having an unjailbroken phone?