1. First find “Settings” on your phone.

2. Click Settings and find "General".

3. Click to open "General", slide down with your finger, and find "Accessibility".

4. Click to open "Accessibility", slide down with your finger, and find "LED flashes as reminder".

One: First, you need to open the settings on iPhone7;

Two: Next, find "General" in the settings and click to enter;

Three: Then Find "Accessibility" in General and click to enter;

Four: In Accessibility, find "LED flashing as a reminder" and then turn on the switch on the right;

That's it The incoming call flash on your mobile phone is opened.