You won't need appointment. When I went there last week, they have line with early reservations which was only for iphone11 pro max. I would recommend to call before you go, because when I went there they didn't have all the phone in stock, so if you all ready know which color and model you want give them a call to make sure they have that in stock to save you a trip.
No appointment needed. Plenty of people on hand to answer your questions
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