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[Peter Bittner <1493574@xxxxxxxxxxxxxxxxxx>]

To be precise: Roaming is deactivated on the SIM, really the provider
(Drei = 3 = Hutchinson 3G Austria).

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https://bugs.launchpad.net/bugs/1493574

Title:
  [vegeta] Phone app makes screen stay black during call (so you can't
  hang up)

Status in Canonical System Image:
  Confirmed
Status in unity-system-compositor package in Ubuntu:
  Confirmed

Bug description:
  A similar, if not the same bug, has been reported to be fixed for
  OTA6. This bug report explains that it's no necessary to wait for a
  minute or so on the phone call, but the screen turns black
  immediately, and doesn't turn back on again to allow hanging up via a
  screen control.

  Potential duplicate: https://bugs.launchpad.net/canonical-devices-
  system-image/+bug/1483127

  Device: Aquaris E5 HD Ubuntu Edition
  OS version: 15.04 (r5)

  A) Incoming phone call:
         - Accept the incoming call by sliding the grey middle button to the green button
         - Watch the screen turning black
         - Bring the phone to your ear, speak (as in a normal phone call)
         - Take the phone away from your ear, note that the screen stays black

         How to hang up anyway: (workaround)
         - (continued from above, screen stays black after taking it away from your ear)
         - Press the screen lock/unlock button (= button above volume control)
         - Screen with phone app shows for about half a second, then turns black again
         - Press the screen lock/unlock button again, and try to press the red hangup button quickly
         - Repeat the previous step until hanging up succeeds

  B) Outbound phone call:
         - Open the phone app
         - Slide up Recent calls list from bottom edge, select a phone number
         - Press green dial button to initiate the call
         - Watch the phone dialling and the screen turning black
         - Bring the phone to your ear, speak (as in a normal phone call)
         - Take the phone away from your ear, note that the screen stays black

         How to hang up anyway: (workaround)
         - (same procedure as in A. above)
         - Difference in behavior:
           * In some calls after pressing the lock/unlock button for the first time the screen stays alight (doesn't turn black again after half a second).

  
  Jean-Baptiste Lallement confirms on the ubuntu-phone mailing list:
  In both cases, covering/uncovering the proximity sensor should turn the screen on, if the screen has not been turned off with the power button. (This is not happening.)

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