Contact List Management ← Knowledge Base Can I tell if I have bad numbers on my list? Can I upload a list that I purchased? Does AlertFirst integrate with Do Not Call (DNC) lists? How do I create and upload a list of people to call, text and email? How do I create and upload a mapping contact list? How do I edit/modify a contact list? How do I upload a list of new contacts without deleting the contacts I've already uploaded? How do my contacts opt-in or opt-out of receiving text messages? How do my contacts opt-out of receiving email messages? Is my data secure with AlertFirst? What are alternate contacts? What happens if I have duplicate phone numbers in my contact list? Will my data (contact list or information) be sold or distributed? If the administrator deletes the entire database, are the opt-ins deleted as well? Will all the contacts would have to opt-in again? If I upload an updated contact list with the original Phone Number 1 values, but all other values changed, will the original contacts will be updated rather than deleted?