The phrase "default ringtone" refers to the pre-set sound that plays on a phone when someone calls you. It is the standard ringtone that is there when you first get the phone, before you personalize it or choose a different sound. Full definition
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The iPhone X has its own «Reflection» default ringtone for incoming calls and notifications, which has a soft, mellow twinkling sound that's unique to the device. (macrumors.com)