WorldSIM
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WorldSIM carries decades of history, having started in the physical-SIM era when travelers actually mailed themselves international SIM cards. The company adapted to eSIM technology while keeping the experience travelers expect, with India coverage available in both data and calling formats.
Being UK-based, it brings European sensibilities to customer service and pricing. It's a solid choice if you value working with an established, geographically familiar provider rather than a newer startup.