On https://nationbuilder.com/how_to_phone#configure, it says "Deleting a phone number is an irreversible action. You will permanently lose access to this number. It will also delete all associated text messages, text blasts, and calls." Does this mean that if we delete a phone number after the campaign, that on a person's profile, any activity related to the number would just disappear? This image implies that missed calls that don't leave voicemail are still tracked (assuming, I assume, caller id is available). Can you confirm?