> unlimited downloads at just 400 kbps after their data allowances expire

This is not new. Many Korean mobile plans actually offer even higher unlimited throttled speeds (up to 10 Mbps!)

- You can filter plans by the unlimited throttled speed on this site. The plans are usually titled by `{data amount} + {throttled speed}`: https://www.moyoplan.com/plans

- Even if not throttled, I think data overage charges were capped at about $13 (20K KRW)

So perhaps unlimited 400 kbps will become standard: i.e. no plans will ever charge data overage fees?

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The linked statement didn't seem to specifically mention the 400 kbps thing at all.