GETTING STARTED WITH ZENDESK TALK 20 the PDFs of ebooks, case studies, white papers, etc.? They’ll need to be updated too. Crowd source this question: Where else do we share our phone numbers? Business cards, social media profiles, and phone directories all need to be updated. Create some buffer If possible, implement the new number while the old number is still in service. This will prevent customers who use the old number from falling through the cracks, and will also provide the opportunity to give them the new number. Implement the new number while the old number is still in service.