If I had to guess, >90% of phone calls are spam/scams or redundant information I received already over another channel. If they're one of the very few people in my contacts I'll likely pick up, or if I have a reason to be monitoring phone calls (i.e. job searching) I'll pick up. Regardless, my phone is always on silent or vibrate.

Even in the above mentioned d exception cases though, more people are calling me from other services such as Discord, Snapchat, Messenger, Teams, etc.