Would I need to sign in during the preorder?

I'm preordering the iPhone x on October 27th, the carrier I'm going to use the iPhone x for is T-Mobile. I'm going to order the phone through the Apple Store app, I know that when you preorder it through sprint, Verizon, and ata&t, you will need to sign in during the preorder, but would i need to sign in when I choose T-Mobile?

Yes, you will need to sign in. They will need to know who is preordering it.

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