A blocklist ensures you never call leads that do not want to be contacted. This is done by using 2 simple features, blocklist & automatic deduplication.
Setup
Create a list with leads that do not want to be contacted or you shouldn't contact for any reason. Next:
Go to the List Configuration section for that specific list.
Under Settings, select Blocklist tick box
Click Save.
Using the Blocklist
Whenever you upload new leads within Myphoner you can use the automatic deduplication feature to remove the leads that are in the blocklist. To do that:
Go to Manage > Duplicates > Dedupe
Select the list(s) you want to dedupe.
Under Dedupe Strategy, choose one of the two blocklist options:
Dedupe all leads matching Blocklist leads — scrubs every matching lead, whatever state it is in.
Dedupe new leads matching Blocklist leads — only scrubs leads still in state "New", leaving anything you have already worked untouched.
Decide which Dedupe Method to use (delete will generally work with this process; choose archive instead if you would rather keep the leads and their history out of the queue than remove them).
Click Run.
For a detailed overview of bulk deduplication check out the full article