You can use your iPhone or iPad as an Apple TV remote, head to Settings > System ... press and hold the TV button (Control Center icon) and the Volume Down button together for about 5 seconds ...

Apple includes a feature that lets Apple TV users locate a misplaced Siri Remote using their iPhone. Keep reading to learn how it's done. Prior to the launch of the latest ‌Apple TV‌ 4K ...

Siri on the Apple TV works much like Siri on the iPhone ... to the Siri Remote, offering virtual controls for navigating the Apple TV interface, accessing Siri, and controlling volume.