Do I need to unlock an iPhone 7 Plus bought from Apple and activated with AT&T when I sell it later?

I originally purchased an iPhone 7 Plus directly from Apple. It is supposed to be unlocked by default. Then I activated that iPhone 7 Plus with AT&T. When I sell it later this year, is this iPhone unlocked, or will I need to request AT&T to unlock it (just because I activated the phone with ATT)?

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