The app/ bot name cannot be changed if you have subscribed to our Stella Slack App. You can only change the app name if the app is owned by your team (custom app).
Yes, you can change the number before the deployment. If your WABA is created with embedded signup, you should be able to access the WhatsApp Manager. Click the "Add Phone Number" on the top right corner to add the new number with the same display ...
Please submit a ticket to contact Stella Support team to request a change of display name if you could not edit the display name in the WhatsApp Manager. For example, you have received the error: "You have reached the limit of display name changes ...