What is the contract for the plan if I use an overseas USIM?

I'm planning to travel abroad for about a week.

I'm thinking of using a local USIM except for a Korean USIM.

But it's just been a while since I bought a new phone, so there's a plan agreement and a mandatory maintenance period.

I was wondering if there's a penalty if I'm wearing an overseas USIM

1117 2018-01-10 Gentleman

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