How can the mobile phone return to normal without sound?

How can the mobile phone return to normal without sound? If the speaker is silent, it is suggested to try the following methods: 1, press the volume+key to turn up the sound;

2. Enter the mobile phone settings-turn off the mute mode in the sound and set the mobile phone to the ringing state;

3. If a song is being played, please check whether there is sound on the speaker during the call and rule out the abnormality of playing music, video and other resources;

4. Restart the phone to see if it is restored;

5. Go to phone settings-General/More settings-Restore factory settings-Restore all settings. If the problem still exists, please take the purchase invoice, warranty card and mobile phone to the nearest after-sales service center for testing and handling.