The proximity sensor in the iPhone 4 is what tells it how close the phone is to your face so that it can turn the touchscreen off although you’re generating a phone call. This has the effect of a) saving battery power, and b) preventing inadvertent touches of the screen by your face.
The dilemma is that the proximity sensor in the iPhone 4 is on a hair trigger. It’s either not sensitive enough, miscalibrated or both. In over three years of utilizing the iPhone 2G, 3G and 3GS I’ve never accidentally hung up on, muted or put a call on speakerphone although holding it up to my face - not once. Yet I’ve carried out it a half dozen times on my iPhone 4 over the past weekend.
Iphone 4 Mute Problem - Cydia proximity sensor , iphone 4 mute face , iphone 4 accidental mute
But excellent news! You will find conflicting reports but Apple has apparently fixed the widely-reported iPhone 4 proximity sensor problem in iOS 4.1 beta 2. MacRumors says the problem hasnât been addressed, but Cult of Mac says that beta 2 fixes the bug. As an added bonus, Cult reports that beta 2 also includes a baseband update (AT&T 7.1), which apparently fixes HSUPA upload speed issues - which slowed video and photo uploads to a crawl.
The iOS 4.1 beta 2 update is only available to developers, but it might be released immediately the end of August if testing goes well.
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