Believe that many users have encountered such a situation: sometimes you have a call, holding a cell phone to slide to unlock answer, but found that finger strokes several times without success, part of the users may think that the iPhone screen may have problems. In fact it is not, this situation is due to the following reasons.
1. The reason of static electricity
Everyone should have such a feeling, more is the dry season more such problems. In general, your mobile phone put in the pocket and calls appear such problem. This is because the phone friction with the trousers in the pocket, electrostatic cause temporary failure of the screen. So when it removed the electrostatic can return to normal.
The solution is actually quite simple, you can try to use the entire palm of your hand to wipe the screen 2-3 times, in order to remove static electricity. Another way to do this is when you put the iPhone in your pocket, keep the iPhone screen on the back of the thigh, so that you can reduce the amount of friction.
2. Water on the iPhone screen
Check if there is water in your screen before you are ready to slide to unlock. If yes, please dry them.
3. Check the VoiceOver on your iPhone
If your phone suddenly can not slide to unlock, try any method and even restart the iPhone does not work, may be your iPhone accidentally opened the voiceover mode. Enter Settings->General->Accessibility->VoiceOver
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