The fullscreen alert does not appear
PhonesTurn on Fullscreen Alert for the prayer, then grant two permissions.
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Adhan app: prayer alerts, the muezzin's voice and the full-screen alert — FirdawsWay Guide 2 · 4:21
Chapters and transcriptSettings › Notifications › tap the prayer. Turn on Fullscreen Alert.
Choose an Alert Background underneath, if you want one. Tap the title Alert Background to see them all: with Premium, the Animated tab's backgrounds move — birds, mist, stars — and make no sound.
Android
Grant Pop-up Alerts and Lock Screen Alerts when asked.
Android
In the appGrant both permissions
iPhone
On iPhone there is no extra permission, and the alert never wakes the screen: it opens when you tap the notification, or by itself if the app is open.