Can I take out the USIM on my phone when I travel abroad?

I'm planning to travel abroad.

Do not apply to block data or roaming.

Can I just leave this in Korea without the USIM on my phone?

If this is the case, is it possible to connect to Wi-Fi from abroad?

And can I buy USIM from overseas and insert it?

1415 2017-04-30 Gentleman

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