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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.
Yes. Unlocked iPhones that aren't connected to apple.com can be used with any network.
To see if your status is up to date, if you are not already a member of the program, you can check your upgrade status. You can upgrade online or in person at an Apple Store to speak with a specialist. After six months, you can upgrade as long as you have made at least 12 payments. You can upgrade if you need to pay an extra amount to cover your 12 payments. As part of the program we will help you trade in your iPhone. Please do not use the standard Apple Trade In option to trade in your iPhone.