Expense reports run on paper trails, and a paper trail is exactly what a foreign SIM historically didn't leave. Cash at a kiosk, a scratch card in a language you don't read, a receipt that's more of a rumour by the time you're back at your desk. A travel eSIM, bought and paid through an account, leaves the trail by default.
That difference matters more than it sounds when a trip is three cities in four days and the expense form is due Friday. Nobody wants to be the one reconstructing a currency conversion from a paper scrap found in a jacket pocket a fortnight later.
VAT is already in the price you saw
Every price shown at checkout is VAT-inclusive. What you see on the plan page is what leaves your card, and it's what should appear on the invoice, with no separate tax line added afterwards to explain to finance. For expense purposes that matters more than it sounds: one number, matching one charge, matching one line in your statement.
Getting the receipt
Every purchase generates an invoice sitting in your account, downloadable as a PDF whenever finance asks for it - which, on a business trip, is usually the week after you'd rather not think about the trip again. No screenshotting a kiosk receipt in a language you don't speak, no reconstructing a cash purchase from memory. Log in, find the order, download the invoice.
It's dated and itemised the same way any other online purchase would be, which means it survives whatever expense software your company runs without needing a manual note explaining what it was.
2分で設置完了、手荷物受取所の手前で使用可能。