A number already on the WhatsApp Business API can be moved between providers. You keep the number, its display name and its quality rating; what changes is which platform sends and receives on it.
What carries over
- The phone number itself
- Your verified display name
- Your messaging quality rating and current send limit
- Your Green Tick, if the number already has one
What does not carry over
- Message history held by your previous provider
- Templates, which must be recreated and re-approved
- Automations and flows built in the other platform