Just to be sure… did you by chance use reward points to purchase the power bank? I used points to purchase accessories and they shipped separately. Was a bit confused, but the phone arrived later.

https://support.apple.com/en-us/HT203042#:~:text=Deregister iMessage online&text=After you complete deregistration%2C your,they send you a message.

Use a wood toothpick to clean the pocket lint out. You’ll probably be amazed how much you can dig out of there.