Klook eSIM

Klook is best known for selling tours, attraction tickets, and activities across Asia, and its eSIM sits inside that same app as one more bookable item rather than as a standalone product built from the ground up. Worth knowing upfront: Klook's eSIM isn't run on infrastructure Klook itself owns, it's a white-label version of RedteaGO, a Hong Kong-based eSIM provider (eSIM Access Ltd), which ultimately routes through Multibyte Info Technology as the mobile network operator on Three Hong Kong's network.

That layered structure doesn't make it a bad product, RedteaGO is a legitimate, functioning eSIM network, but it does mean you're not getting anything distinct from what you'd find buying directly from RedteaGO or a similar reseller, aside from the convenience of one Klook account and checkout. Plans are data-only, fixed-GB, sized per destination across the usual popular Asia travel countries. For travelers who are already booking activities through Klook for a Japan, Thailand, or Vietnam trip, adding the eSIM to the same cart saves a step, but it's not a reason on its own to choose Klook over a dedicated eSIM app.