How to turn off the message prompt of Apple's mobile phone?

There are two ways to turn off message prompts. The first method is to mute the phone. There is a volume master switch on the left side of Apple's mobile phone, so there is no sound when the call comes. The second option is to turn on the settings. If a sound is found, you can select No to close the message tone in the message tone change interface, so that the incoming call still has a sound.