CRBT is the abbreviation of "Personalized Multicolored Ring Back Tone Service", which is a service that called customers set special sound effects (music, songs, story lines, conversations between people) for other calling customers who call their mobile phones.

After the called customer opens the CRBT service, when the calling customer dials the user's mobile phone to wait for the connection, it will no longer hear the "beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep beep The considerate CRBT service fully demonstrates the unique personality and taste, and makes the simple communication process full of fun.

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After handling CRBT service, the system will automatically set a ringtone as the default ringtone for you. Default ringtones are provided by mobile companies and content providers. Mobile companies can use different sound effects as the default ringtone of the system, and can change the default ringtone when appropriate. Some regions also support setting multiple default ringtones.

Every ringtone has a certain copyright period. After you customize or download it to your personal CRBT library, you can use it for a long time as long as you don't delete it and the copyright of CRBT has not expired. If the copyright expires, Mobile has the right to replace the ringtone with the system default ringtone.