deja vu… I think we had a similar thread to this…hmmm maybe not 
anyway… no I do not pick up if it is an unknown call and if it’s an unknown caller how can u call back to find out who it is? 
if the unknown caller is someone I know then they need to leave me with a message in order for me to call them back. No message then no urgency IMO.
when I go to bed 9 times out of 10 I put my phone on vibrate…unless I am expecting someone’s call 
If I am upset and someone keeps calling…I avoid the call for as long as possible. Eventually I give in and pick up if they have called me enough times 
How do I deal with those people. I deal with them accordingly…depends on who they are and what they want. Most of the time I am pretty calm in dealing with them.