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Apple.com orders cannot be shipped outside the country/region where they were purchased. You can visit the online store for the area where you would like your products to be delivered.
Yes. Yes. An unconnected iPhone purchased on apple.com will not unlock. After activating your iPhone, it will remain unlocked. You can use it with any network offering iPhone service. Only an AT&T Installment Plan is allowed to unlock your iPhone. It will remain locked to AT&T, and it will only be able to work on AT&T networks for the terms of your Installment plan agreement.
The iPhone 13 Pro Max Max, which retails for $1,099 at the introductory price, is a significant purchase even for Apple fans. The price is actually the same as last year's iPhone 12 Pro Max, however there are many beefier upgrades that will make the price worthwhile.