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Why does Apple 6 sometimes flash and sometimes it doesn't?

Apple 6 Call Flash Setup Tutorial:

1. First open the Settings of Apple iphone6, then click General, and find and click Accessibility in the general options.

2. In the auxiliary function, find "LED flashing to remind you", and then turn on the switch on the right. After the setting is completed, the Apple 6 call flash is set successfully.

3. Next, you can call yourself or send a text message to check whether the LED on the back of the phone will flash.