Um I dont see how these posts answer the OP question but I was trying to figure this out too, until I installed a custom rom and had to wipe data. So brand new frequently called list. I have seen no button to clear the list otherwise.
The App is called Frequently Called Remover, but it doesn't work on the new Ice Cream Sandwich OS for the droid..... I have the Nexus and it doesn't work, but for every other Android phone it does..... I sent the developer a note to hurry with the fix for ICS
I tried everything under the sun after reading blog after blog. Finally, I downloaded another phone app - TRUE PHONE. I'm not working for them, trust me. But I like the app. In it, favorites are favorites. Your list of recents is always in the home screen (plus the dial pad), so you don't need to move to history to find your recents. Favorites is an easy tab on top of the screen. I'm liking it. The frequents creeping in my favorites was a featured I detested in my old phone app. By the way, I have a Moto X with Lollipop.
put your finger on the person in your frequently called list it will show with little round tab beside it with a check mark. Then go to drop-down menu right hand top corner it will as if you want to remove it from everywhere or just favorites click favorites and your done. I just did mine..good luck. ??????
Does anyone have any other ways to do this? That setting doesn't exist on my phone, it must be part or Samsung's Android skin. I'm running Android 7.1.1 on a Moto Z Force. Motorola runs pretty close to stock Android