If I do a Factory Reset on a phone I buy unlocked, will it lock up again or not?

I am buying a smartphone on Amazon and it sells brand new as unlocked.

If for some reason in the future I need to factory reset it, will it lock up, and then I'd need an unlock code etc?

Here's the one I am buying:
Unlocked Cell Phones 6.0" Dual Sim MTK6580 Quad Core 1GB/8GB-JUNING Android 5.1 Smartphone Gold

(I can't post the amazon link as the forum won't let a new user dot hat yet.)



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