Every time a mobile phone sends a message, it will ring. What's the bell?

I think I have set the message alert tone on my mobile phone, and so has my own mobile phone. When there is new news, there will be music. If you don't want a ringtone, you can set it yourself and find it in the phone's System Settings or Settings, Profile Mode or Sound.

Just follow the instructions inside and close it. All ringtones and the like can be done in the settings.