Why my iPhone isn't alerting me of incoming calls?

Hi!

This has been happening for a few months and it is frustrating. My phone will no longer ring, vibrate, or even give me a notification or light up if someone is trying to call me.

I never know until I look at my notifications and it tells me I missed a call. My phone has stopped doing anything to notify me that I have an incoming call.

I have looked at all of my settings and nothing looks wrong, I don’t know what to do. I never have my focus on. I would like to be able to have the opportunity to answer my phone when someone calls instead of saying “sorry I missed your call. My phone never tells me someone is calling me.”

I have an Apple Watch and it used to tell me someone was calling me too and that has stopped as well.

I am very frustrated.

[Re-Titled by Moderator]