If I use LG U+ while using KT, will LTE speed be severe?

I'm using KT now.

GS25 plan is so attractive that I'm thinking about transferring.

I'm more worried about LTE speed than anything else.

If I use LG U+ while using KT, will LTE speed be severe?

Or is there a big difference in speed?

335 2018-06-22 Gentleman

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