Mobile plan in Korea comes with data following the Fair Usage Policy (FUP). For mobile plans with unlimited data, the internet will be limited after a certain basic internet is used. Here is the general concept of different speeds:
400kpbs: Super slow, only available with text messages and video in 240p
1Mbps: Slow, available with text messages, small picture files and video in 480p
3Mbps: Recommended, available with text messages, big picture files and video in 720p
5Mbps: Fast and recommended, available with text messages, big picture files and video in 1080p.

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