Some Android devices come with a built-in IR blaster ... Another effective method to turn your smartphone into a remote control is by using an external hub, such as the Logitech Harmony Hub.

Yatse is designed as a remote control app for Kodi, but it also works with Plex, Emby, Jellyfin, and your local hard drive's files. Once again, it is only available on Android devices. Except for ...

Though the remote isn't essential — you can also control your Roku via a smartphone app on your iPhone or Android device — it's pretty convenient. If your remote isn't working, you might need ...

with full remote control for Android devices and remote viewing for SDK-enabled iOS apps. The report, however, also notes that its automated iOS and Windows Phone enrollments are limited to email.