If you’re like most iPhone 5s owners, you probably don’t use the Flash Notification feature that’s built into your phone. But if you ever need to use it, here’s how to do it. To enable Flash Notifications on your iPhone 5s, open the Settings app and tap on Notifications. From here, scroll down and tap on Flash Alerts. You’ll now see a list of all the notifications that have the Flash option enabled. Tap on one of these notifications and then choose whether you want to enable or disable the Flash feature for this notification. Once you’ve enabled or disabled the Flash feature for a notification, it will appear in the list of notifications that can be flashed with a quick double-tap. To flash a notification, just double-tap on it and then choose whether you want to play the notification immediately or wait until it goes offscreen before playing it. ..