Call block is wonderful, but some of the earlier Panasonic models only allow 30 phone numbers to block. Sadly, phishing scams and other techno crimes are so common that many people need in excess of 30. For Panasonic users, you can "unblock" old call block by pressing the following:
Menu
#
217
down arrow key
# to unblock
Erase
up arrow key
Yes
Off
Hope this helps the Panasonic cordless users who need more "call block" room on their phones!