To listen to music on an iPhone without Wi-Fi in 2026, you must download the music for offline use before you leave the ground. On Apple Music, find the album or playlist you want, tap the "+" icon to add it to your library, and then tap the cloud/arrow icon (Download). You can verify this by going to "Library" > "Downloaded." If you use Spotify, you must be a Premium subscriber; toggle the "Download" switch on any playlist until a green arrow appears. In 2026, YouTube Music and Amazon Music offer similar "Offline Mode" features. Once on the plane, put your phone in Airplane Mode, which disables cellular and Wi-Fi but keeps Bluetooth active so you can use your AirPods. A pro-tip for 2026 is to enable "Automatic Downloads" in your music settings, which ensures your most-played tracks are always stored locally. Always check your storage space before a long flight, as high-fidelity "Lossless" files can take up significant room on your device.