What's wrong with Samsung galaxy s7 mobile phone without any sound?

If there is no sound on Samsung S7 mobile phone, it is suggested that:

1. This may be because the option to turn off all sounds is set. It is recommended that you turn off all sounds by sliding phone settings-accessibility-hearing.

2. Set-Sound-Volume and try to turn up each volume.

3. If it is invalid, please back up data (contacts, multimedia files, etc.). ) and restore the phone to the factory settings.

If the problem still exists, please take the purchase invoice, maintenance card and machine to Samsung service center for inspection by engineers.