Hi,
If you don't have any ringtones to select from on your Samsung phone, you can try these steps:
Check your sound modes
Go to Settings > Sounds and vibrations > Sound modes and make sure you've selected a mode that includes ringtones.
Check your mute settings
Go to Settings > Accessibility > Hearing enhancements and make sure Mute all sounds is turned off.
Check your Airplane mode
Swipe down from the top of the screen with two fingers to open the Quick settings panel and make sure Airplane mode is turned off.
Check your Do not Disturb settings
Swipe down from the top of the screen with two fingers to open the Quick settings panel and check your Do not Disturb settings.
Restart your phone
Swipe down from the top of the screen with two fingers, tap the Power icon, tap Restart, and then tap Restart again to confirm.
Update your software
Go to Settings > Software update and download and install any available updates.
Clear your cache
Go to Settings > Apps > Phone/Samsung Dialer > Storage > Clear cache.
Boot your phone in Safe Mode
Press and hold the Power button, tap and hold Restart, and then tap Safe mode when it appears.