Can I use my old phone number for WhatsApp Business API integration and migrate the chat history
It is possible to use your old phone number that is already registered in your WhatsApp Business application. Still, currently, there is no way to import existing chats from WhatsApp Business to WhatsApp Business API.
You may follow the steps below if you would like to back up chats:
Step 1: Prepare a new phone and a new SIM card
Step 2: On your original phone, go to WhatsApp Settings > Chats > Chat Backup > Back Up Now.

Step 3: Remove the old SIM card and insert it into your new phone
Step 4: Download WhatsApp on your new phone and register your original phone number
Step 5: On your new phone, Go to Settings > Account > Delete My Account. Deleting the WhatsApp account (associated with that phone number) on your new phone would not affect the chat history, which is stored in the original phone.

Step 6: On your old phone, insert a new SIM card, open Whatsapp and link it to the new phone number. You can browse the old chat history on your old phone.
Upon completing the above steps, please go back to the Omnichat platform to proceed with the WhatsApp Business API migration.
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