No, it's highly unlikely that roaming in popular Asian destinations like Thailand or Vietnam would be free with your standard European or US SIM card. Most home carriers classify these countries outside their free roaming zones, meaning you'll face their highest 'Rest of World' international roaming rates, which can quickly lead to an expensive bill. An EastESIM offers a far more cost-effective and transparent solution. It connects you to reliable local networks like AIS in Thailand or Viettel in Vietnam at a predictable, affordable price, freeing you from bill shock worries.
Is roaming free in Thailand or Vietnam with my European or US SIM card?
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