Roamic
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Roamic's eSIM plans start as low as €0.99 and cover 190+ countries including Mexico. Activation happens instantly through QR code, with flexible daily data limits that let travelers pay only for what they use on a given day, then pick up again the next day if needed.
The service appeals to budget-conscious travelers and those making frequent short trips, since the daily limit structure means you're not locked into a full monthly plan. Roamic also offers a refund policy if you're unsatisfied, which reduces the risk of trying it for the first time.