A:AnswerNot from Best Buy you can’t. You’d have to go to Apple to purchase an unlocked phone. Best Buy makes you purchase a plan or add it to an existing plan when you purchase the phone.
A:AnswerIt’s my understanding that Best Buy don’t sell unlocked phones anymore. You’ll have to go to Apple for that. Once you choose AT&T, I believe the phone is carrier locked. Now with the new eSims, I don’t know if that’s changed.
A:AnswerThere is no port on the iPhone 14 Pro Max for SD cards. You can however purchase Apple's Lightning to SD Card adaptor for $32.99 (taxes not included).