How do I block a caller who keeps calling or leaving voicemails?

You can block numbers in two places:

1. In the call log under Activity, use the button to block the caller.
2. In the Voicemail tab, when you are looking at a voicemail from someone you do not want to hear from, use the button to block the caller, similar to blocking a number on an iPhone.

The blocked caller will not reach the line next time. Inbound calls have a cost, so blocking spam callers also stops that charge.

If a new number gets many odd calls, it may have been heavily used by its previous owner, and you can pick a different number.