1. AC Question's Avatar
    Im concern because nobody in AT&T knows the phone and can not explain why the screens turns black during a phone call. If by any chance I have to press a key of the dial screens as often occurs during a service call. Do I have to return the phone and ask for guarantee of that's something normal that can be take care of? Please help !!
    07-21-2015 06:52 PM
  2. belodion's Avatar
    Welcome to AC.

    That sounds like it may be a fault, perhaps with the proximity sensor.
    Make sure nothing is blocking it, such as a case or the way you hold the phone. If there's nothing blocking the sensor, consider a return or exchange.
    You may also care to do a Play Store search on 'Proximity Sensor', which will show several apps which may fix your problem.

    Posted via the Android Central App
    07-21-2015 07:00 PM
  3. ProfBenj's Avatar
    After much research in forums and trial and error, I have traced the problem to the GLASS screen protector. This obscures the proximity sensor. Removal has cured the problem at once. Thanks to the only poster (sorry I can't remember who or where) for the suggestion. Another post led me to a useful resource, access to a range of testing utilities (including light and proximity sensors) by 'dialling' 77634#*#
    Thanks, Forum, helpful as always.
    07-24-2015 07:43 AM

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