AT&T iPhone 6 Plus on T-Mobile/Sprint/Verizon?

I have an AT&T iPhone 6 Plus (Model A1522, MGAU2LL/A) and planning to sell it but I don't know if it will work on the other carriers. Will my phone work on the other USA wireless carriers?

Only if you unlocked it, and even then, it would only open it up to T-Mobile.

Sprint and Verizon network use different communication bandwidth.

Possible, though if it can't just sell it as an AT&T only model.

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