Sim Local
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Sim Local has earned 4.8 stars on Trustpilot across 500 reviews, backed by KDDI (the au network), one of Japan's leading carriers. Their Japan plan offers 10GB per day at full speed, with unused high-speed data rolling into an unlimited fair-use pool, plus 7-day starter options priced around $17.
The KDDI backbone and strong Trustpilot score make Sim Local a safe choice for data-hungry travelers. Its hybrid model (fixed daily high-speed pool plus fallback unlimited) balances affordability for price-conscious visitors with speed for anyone who won't tolerate throttling mid-trip.