Came into a Note 20 ultra off the AT&T network. Long story short my folks upgraded phones and gave their old phones to my sons to treat like tablets. I figured I'd take the note 20 ultra for myself since it's way nicer than my current phone. My problem is I need to get the Note 20 ultra over to the T-Mobile network where I have my current phone and plan. Is it as simple as approaching T-Mobile and asking for another sim card, or do I need to hit up AT&T first and ask them to unlock the phone? If anyone knows of other ways please drop that info. I'd greatly appreciate it.