Can I buy LG U+ when I buy a used phone?

I'm going to buy a used phone and use it for a while because the repair fee is high.

I use a SKT carrier now, and among used phones, LG U+ carriers are really cheap.

I know it didn't work when I was a 2g phone in the past, but

Iphones can also be used by all three carriers, so I think there's no difference in 3g or LTE.

Can I buy a used phone from LG U+ carrier and use it as SKT?

382 2017-03-13 Gentleman

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