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AppleInsider posted a news story that users report issues with iPhone 4 proximity sensor during calls



A support thread at the Apple Discussions forum had quickly swelled to 16 pages and more than 230 posts through Monday afternoon, with users last week beginning to register complaints that the proximity sensor on their iPhone 4 is not working properly. Users said they have accidentally hung up a call, placed someone on hold, enabled speakerphone, or attempted to engage a FaceTime connection while placing a call.

"I can confirm that the iPhone sensor is working by covering it with my finger, but when held to my face, the screen blinks as if it cannot decide to disable the screen or enable it," user mdalegre wrote. "It results on me hanging up, putting calls on mute, and dialing numbers accidentally while I'm on the phone. This occurs on 90% of my calls."

Multiple users have responded, stating that they have owned previous generation iPhones and never had a problem with the proximity sensor. However, the issues seem to occur for some with the new iPhone 4 handset, released last week.
  Users report issues with iPhone 4 proximity sensor during calls