I don't know when it changed, but one of the updates to my Android smartphone included call blocking. So as long as the call is still in the log/history, I can block it, not just while the phone is ringing. Use it fairly often.........
In the new era of cellphones, area codes aren't necessarily enough info to decline a call, but I sometimes do. I live in WV, but still use a 702 area code cell # (Las Vegas). Added a free google VOIP # to it so I can also call from a 304 area code# from the same cellphone.
When the Admiral and I first added our landline # to the national do not call list, seemed to spike the # of calls we were getting...... A few years later when they made a separate cellphone do not call list, another spike in calls...........
BTW: A business class professor of mine in 1984 predicted that in our lifetimes, people would begin to be assigned 2 numbers that would follow them where ever in the world they went, and wouldn't change for their entire life:
a Social Security #
and
a personal cell#
Since cellphones were a $3K 2lb 'brick w/ limited range/talk time, we thought it unlikely.... Not to far off the mark now.
Boom, I too like the OEM hands free phone in our newish Kia.