Install a player app on the Firestick itself from the Amazon Appstore, such as TiviMate or IPTV Smarters, then add your subscription's M3U playlist link or Xtream Codes login inside it once the app opens for the first time. This is the more common path because the Firestick handles the stream directly rather than relaying it from another device, which means fewer moving parts and no dependency on a phone staying connected and awake nearby the whole time you're watching. It's also the setup most player apps are actually designed and tested around, which shows in how stable it tends to be.

Some Firestick models support screen mirroring, which sends whatever's playing on a phone or laptop over to the TV using a short-range wireless connection. This can make sense if you already have IPTV running through a different device and just want it on the bigger screen occasionally, without installing anything new on the stick itself. It has real downsides for daily use: the source device has to stay on, connected, and free of interruptions like calls or notifications, since anything that pulls focus on the phone breaks the cast mid-stream.

A direct player app on the Firestick generally holds up better over a long viewing session, since the stick decodes and displays the stream itself rather than depending on a second device staying stable for the entire time you're watching. Mirroring adds an extra step between the source and your TV, and any hiccup on the mirroring device, a dropped Wi-Fi connection, a low battery, a background app update, shows up on your screen even though the Firestick itself and the underlying subscription behind it did nothing wrong at all.