I feel like the best mobile plan insofar for traveling has been Google Fi: $10/GB anywhere in the world, allows you to pause service and pay nothing, works both as a physical and eSIM card.
The downside: only available for purchase in the US.
The downside: only available for purchase in the US.
Literally a 100x premium.
By US standards, Google Fi is cheap.
Not any more. I pay $25/month for unlimited text/voice/data service in the US, and there are quite a few providers that are even cheaper.