Hope this helps someone! 😊 Model tested on: Panasonic KX-TG9541. Should work on TG6xx, TG7xx, TG8xx series.
I recently blocked a number by mistake and spent 20 minutes hunting through menus. If you need to unblock a number on most Panasonic cordless phones (KX-TG4011, TG658, TG78xx, etc.), here is what actually works.
Solved: How to Unblock a Number on a Panasonic Cordless Phone (KX-TG Series)