There is also Ubigi - http://ubigi.me http://ubigi.me They are becoming a dime a dozen. Increasingly I find you can download the carrier apps ahead of time dir

There is also Ubigi - http://ubigi.me http://ubigi.me They are becoming a dime a dozen. Increasingly I find you can download the carrier apps ahead of time directly and keep 3-4 esims around indefinitely. I get sufficient data for about $5/mo in just about all Asian countries this way. Most of the airports, even tiny ones, have wifi now - and it takes <5 minutes to set this up. The folks at the airport try to sell you overpriced tourist packages (or in Vietnam sometimes its a sim that fell off the back of a truck, they clone 'em) but you can just insist on an esim or wait until you're in town. Google FI also lets you pause service for 3 months, so I turn it on for 1 day here and there and the credits roll over. I might get rid of it but it's a good backup at a known flat rate ($10/GB).