KDDI/au Japan
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KDDI's povo service builds eSIM specifically for people making regular Asia-Pacific trips, and Vietnam sits squarely in that region. You can activate roaming by the hour or day depending on how much you'll actually use the connection, paying only for what you need.
Povo appeals to cost-conscious travelers from Japan who want flexibility without a long-term contract or minimum commitment. The granular daily data add-ons make it sensible for mixed trips that include several Southeast Asian countries where usage patterns vary.