How to use messengers for the organization?

Question

Messengers

Hello. Need advice. How to use WhatsApp, Viber for business. That is, there is a customer base, how to work with it in instant messengers. As far as I understand, they are tied to the contacts in the phone on which you install it, and you can’t add anything from the computer there. That is, you need a corporate SIM card, and add our entire database to contacts?