I compared 1,489 eSIM plans in 199 countries. Price per GB varies 105x

Disclosure: we run Bitcall, which sells travel eSIMs. The prices below come from our own catalogue, so read them as one provider's prices on one date, not a survey of the market. We wanted to answer a simple question: how much does mobile data cost a traveller around the world? We had the data on our own site, so we turned it into a small price index. Here is how it works, with the code and a few things that surprised us.