What's wrong with the cell phone loudspeaker?
2, pull down the phone status bar to see if the system is set to ring mode;
4, backup data (contacts, text messages, etc.), restore factory settings (settings - system more) - restore factory settings, please do not tick "completely cleared";
3, check phone calls, hands-free sound, excluding video, music and other resources;
If the relevant circumstances, you can carry out the following investigation:1, restart the phone, to observe whether to restore;
