This relies on cellphone and model. Do you continue to have an iPhone with a bodily ringer change? Use that. The change place in the direction of you turns the ringer on. (I appear to recall that there was a capability to disconnect the change with this setting within the System Preferences -> Sound choices, however I now use an iPhone 15 so I can not confirm. However…)
Do you’ve got a more moderen iPhone (iPhone 15 or 16) with the “Motion Button” above the quantity controls? Holding that button acts as your Ringer Swap by default, however it is perhaps rebound to one thing else (System Preferences -> Motion Button). In case you have an Motion Button, you must have the Ringer state in your Management Middle. Swipe down from the very high proper of the cellphone, and the Bell icon will both be “off” (like the vast majority of different buttons there) which is the traditional state, the place the traditional state is when it WILL ring. However based mostly off your description the Bell icon may have a slash by means of it. Faucet it to cycle it.
One final risk is that you’ve Notifications for the cellphone turned off. (System Preferences -> Notifications. Scroll right down to Telephone, faucet it and evaluation its settings.) Nonetheless, these settings being turned off should not have aren’t according to the “bell with the slash by means of it” visible you described.