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Hi @Mercy2849, we're here to help you.

To answer your question, you can return/exchange iPhone 15 pro at AT&T owned retail store, or you can return the device through mail. If the iPhone 15 pro max is available in stock, you can exchange or place a new order.

You have 14-day return/exchange period. 

Please follow the instructions

• Disable security features like Find My iPhone or Find My Mobile for Android.
• Sign out of any cloud services.
• Remove all passwords and user locks.
• Erase all personal data like contacts, photos, and videos.
• Remove any accessories or memory cards.
• Reset the device to factory settings.
• Remove your SIM or delete your eSIM.
  
  You can create return label by clicking on the link Returns: Start Order - ATT Direct Fulfillment (http://sm.att.com/5bb3681d) and follow the prompts.

Check more information about return, Return or Exchange a New Device or Accessory - AT&T Wireless Customer Support (att.com).

Let us know if this helps! 

Thank you for reaching out to the AT&T Community Forums!

 Susan, AT&T Community Specialist