I've seen many threads on the net about blocking phone numbers. It's always said to use the somewhat hidden blocking mode. I still haven't found that, but I did find a way to block up to 100 numbers from ringing through.
Open the phone dialer (stock one)
Touch Menu
Call settings
Call restriction
Auto reject mode ON
Auto reject list
There ya go. What could be easier.
Open the phone dialer (stock one)
Touch Menu
Call settings
Call restriction
Auto reject mode ON
Auto reject list
There ya go. What could be easier.