Yes, but it's in flight mode usually, except once a day. If I've missed a call I call back the next day. My main issue are the spam callers. I turn the cell phone connection on temporarily when needed, for instance for using https://f-droid.org/en/packages/de.schildbach.oeffi/ or if I'm waiting for a call.

If you have an iPhone you can enable 'silence unknown callers' which will prevent your phone from ringing for any incoming call that's not in your contact list. This solves the spam problem.

Super curious to know when you start following this lifestyle?

At this point wouldn't you be better off just getting a landline?

Baseband pings can still track you, I think.