Turn the volume up using the side buttons
Open Sound or Volume settings and increase media, ringtone, and alarm levels
Disable Silent mode or Do Not Disturb mode
Check and adjust Bluetooth output if connected to headphones or speakers
Clean the speaker grill gently
Remove any phone case that may block the speaker
Restart the phone
Turn off any volume limit or sound limiter settings
Enable Loudness Equalization or Sound Enhancement if available
Update the phone software
Test sound in different apps
Reset sound settings if needed