Samsung Galaxy S9 / S9+ - View Device Screen on TV
Smart View allows you to share the device's screen or content on a larger display via a wireless connection.
To view your smartphone's screen via an external display, a compatible HDTV or a Wireless Display adapter (e.g., Chromecast™) is required. A Wireless Display adapter can be purchased from any Verizon Wireless retail store or at the online store.
For additional assistance, contact your TV manufacturer.
Some apps (e.g., YouTube, Netflix, etc.) support displaying the app contents on a remote display. Within the app, tap the Cast icon then select the desired display from the list.