Why don't I receive alerts or a notification when I receive a text and I already checked my settings?

I adjusted my setting and even put the ringer and notifications on and put the volume and ringer on and I receive no alert, no pop up, alert or notification when someone texts me. Why?
This is the iPhone X!

Added (1). I went to the cell phone/ carrier store and they didn't help me. They said to go to the apple store or check the settings.
I already adjusted the settings. So what do I do now?

Try resetting the network settings. Its possible too that Do Not Disturb is turned on in Settings and if not may have to backup up pics and everything and factory reset