Phenomenon:
Call, the hand is blocking mobile phones upper part or face close to the upper part, not black screen.

Analysis:
Open opportunity distance sensor, automatic calibration may be blocked in the process of mobile phone boot upper part calibration result in failure.

Solution:
After startup, horizontal mobile phone on the desk. To enter the show Settings -- - calibration distance sensor.

Three steps to calibration.
1. The hand phone blocking upper part, from mobile phones in 2-5 cm. When the circle values between 200-500, click on the calibration button. In the process of calibration, obstructions do not move or leave.
2. Hand completely block upper part as a mobile phone when circle value at around 1000, calibration points close button. In the process of calibration, obstructions do not move or leave.
3. Hand doesn't keep out mobile phone upper part, when circle values within 100, point distance calibration button.

Finish after calibration, calling to test the effect of the distance sensor. The first step of keep out distance is what we want to achieve in practical use screen distance.