My phone has no ring tone for all incoming calls

See this Apple article: Use tones and ringtones with your iPhone, iPad, or iPod touch

https://support.apple.com/en-us/HT207955

Update to ios 15.2.1.

Also try a force restart

Force restart an iPhone with Face ID

To force restart iPhone X, iPhone XS, iPhone XR, iPhone 11, iPhone 12, or iPhone 13, do the following:

Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the side button. When the Apple logo appears, release the button.