Mirroring clones your entire screen, notifications and all, to the TV. It's the universal fallback for apps without a Cast button, and it's built into Android.
- 1Connect phone and TV to the same Wi-Fi network.
- 2Swipe down to Quick Settings → tap 'Screen cast' (Samsung: 'Smart View').
- 3Select your TV / Chromecast / Miracast receiver from the list.
- 4Accept the prompt on the TV if shown; rotate the phone landscape for full-width content.
- 5Stop from the same tile or the persistent notification.
Tip: Mirroring shows everything, enable Do Not Disturb first if presenting. For video content, prefer in-app Cast: it looks better and frees your phone.