my iPhone 8 Plus will not ring when call comes in ?

Make sure the switch above your volume buttons on the left side of the device is towards the screen and that your ringer volume (Settings>Sounds and Haptics>Ringers and Alerts) is at a level that you can hear.

My phone cannot get no incoming calls and it never rings either or shows missed calls

My phone doesn’t receive any incoming calls and it also never rings or shows missed calls either

I have an iphone 8 plus and sometimes my text messages come thru with sound and sometimes not. How do I fix that?