Ringtone (noun)

A sound or melody that is played on a mobile phone when an incoming call or message is received.

Origin:

From ring + tone, reflecting the notion of a sound that rings out when a call is received.

Examples:

1. He set his favorite song as his ringtone.
2. She changed her ringtone to the latest pop hit.
3. The ringtone of the phone was loud and annoying.
4. The ringtone was a unique way to identify the caller.
5. The ringtone market is a billion-dollar industry.