Buying a Locked phone to replace current phone that is already Unlocked

magenta3837973

    I am buying a replacement of my T-Mobile LG G6 Phone that is already Unlocked (for traveling overseas) because I damaged the camera lens.  If I buy a T-Mobile LG G6 "Locked" at eBay, can I used it as Unlocked?  (Can I easily Unlock it?)  I plan to use the SIM and Micro SD that are now on my current G6 phone.

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