You can enable LED flash alerts to help notify you of calls. Follow the steps below to set up visual flash alerts.
To receive visual flash alerts on an iPhone
From your home screen, open the Settings app
Tap Accessibility
Tap Audio & Visual
Under Visual, tap LED Flash for Alerts
Tap LED Flash for Alerts toggle ON (it will turn GREEN)
Tap Flash While Unlocked toggle ON (it will turn GREEN)
Tap Flash in Silent Mode toggle ON (it will turn GREEN)
To receive visual flash alerts on an Android
Open the InnoCaption app
Tap Settings
Tap Advanced features
Tap the Use LED flash alerts toggle ON (it will turn GREEN)