eSIM 的价格由什么构成，为什么各家差这么多

Because what a seller pays for its customers to attach to networks differs by country, driven by competition in that market, the shape of the networks, and local regulation. We do not publish per-country cost figures, since they sit inside commercial agreements and change, but the gaps you see usually come from this layer rather than from wildly different margins.

Not always. Price the whole trip. If the cheaper plan expires early enough to force a second purchase, or does not work well where you are going, the real total is higher. Equally, on a short and light trip a small plan that can be topped up genuinely is the best answer.

Because paying across currencies involves a conversion, and both the rate and any fee are set by your card issuer, not by the seller. If you are comparing sellers, compare in one currency on one day so the exchange rate does not become a hidden variable.

Not necessarily. Real speed depends on which network the plan can use in that spot, how many people are on it, and the plan's own speed terms. A higher price may buy broader network rights or better speed terms, which helps in some situations, but in a crowded place every plan riding the same network meets the same ceiling.

Generally no, because a plan is sold as a bundle of volume and validity rather than as refundable units. The better approach is to size closer to reality and pick something that can be topped up. Refund terms depend on the provider and on the specifics of the order, so if you are unsure, message us with the order number.

Because each plan sits on a different roaming deal; some buy better network access at a higher cost.

Not always. If the validity forces a second purchase, or the speed makes it unusable, the total cost ends up higher.