A:AnswerWiFi calling works with Verizon and T-Mobile, but I don't know if it will work on AT&T as they usually only authorize it for iPhone, Pixel and Samsung Galaxy.
A:Answer512gb is with 16gb RAM it will actually show 24gb because it has 8gb disk expansion for RAM but I turned it off. You can check it Settings -About device
A:AnswerYes, it hasn't worked for some users in North America and users have said it's not supported by Visible. Physical sim from Visible is working though.
A:Answeryes, yes and yes but as most who have answered this question for North American variants of the 1+13 state only compatible with a Visible physical sim, not an esim. I used a Visible physical sim in this phone and all three worked.
A:Answercheck your Brazil carriers for this information. Brazil is part of South America and this phone is a North American variant supported by North American LTE companies.
A:AnswerI'd assume so since they use att owners. My friend has cricket and the sim worked in my oneplus 13 for test the phone out. Most all carries simcards auto install all the cellular info and connect to there towers in any unlock usa phone some China versions work here some don't but this is made for the US market
A:AnswerYou can trade in your phone and get a gift card without buying a phone, so technically you could still trade it in, get a gift card and then buy this.
