
Well I went ahead and tried it. No 128GB AT&T iPad Mini Retina models, nor 64GB, in stock anywhere nearby, or even as far as I saw anywhere tonight. Plenty of Sprint and T-Mobile models around a in stock in local Apple stores. Picked up a T-Mobile version within an hour of ordering it via Personal Pick-Up.
Restored from my existing iPad Mini non Retina iCloud backup. Disabled Find My IPhone and disconnected from network on old Mini and put in AT&T sim in new mini and up and running on AT&T LTE no problems. Did not even try to activate T-Mobile account, just removed sim and maybe can use later if ever needed.
When I tried the View My Account feature did get a message, but not unexpected since part of shared data plan and not a pay as you go account, so I can manage from AT&T app or web as I did before.
Looks like I can cancel my order processing and not expected until early December. Still look to be a good number of T- Mobile and Sprint versions available in stores.
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