How do I make a custom ringtone on iPhone?

You need a sound of 30 seconds or less and a way to add it as a ringtone. On recent versions of iOS, save the audio file to the Files app, tap Share, and choose Use as Ringtone if it appears. Otherwise open the file in GarageBand, tap Share, and choose Ringtone; GarageBand will shorten it if needed.

Then go to Settings, Sounds & Haptics, Ringtone, and pick it. The harder part is the sound itself. If you want a ringtone that is really yours, Ringoz writes one from a name and a short line, sings it, and walks you through setting it.

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