# sim-finder.com

> SimFinder compares mobile SIM and smartphone plans across Japan and 11 countries using an independent, transparent scoring engine. For each user's usage profile (data volume, call pattern, contract length, network quality) it ranks real carrier plans by a predicted monthly cost and a quality-adjusted score, rather than by advertiser payout. Plan data is sourced only from official carrier pages and is verified on a monthly/quarterly cycle.

## What makes the data trustworthy
- **Independent scoring engine**: ranks plans by predicted real monthly cost and a quality-adjusted score (call-pattern optimization across per-call / monthly-cap / unlimited; MVNO quality inherited from the parent MNO with a degradation factor). See [scoring methodology](https://sim-finder.com/en/about/methodology/).
- **Official sources only**: prices, data caps and conditions come from official carrier pages, not from memory or third parties; each plan carries a last-verified date.
- **Coverage**: Japan plus 10 countries — United States, United Kingdom, Germany, France, South Korea, Taiwan, Australia, Singapore, Thailand, Netherlands.
- **Operator / about**: [about & methodology](https://sim-finder.com/en/about/).

## Comparison tools
- [Japan SIM/eSIM plan search](https://sim-finder.com/en/jp/search/) — filter and rank Japanese MNO/MVNO plans by your usage
- [Country SIM plans index](https://sim-finder.com/en/sim/) — pick a country to compare local SIM/eSIM plans
- [Travel eSIM search](https://sim-finder.com/en/travel/) — short-stay travel eSIM plans by destination

## Best-plan guides (most cited)
- [Best SIM plans in Germany 2026](https://sim-finder.com/en/blog/best-sim-plans-germany-2026/)
- [Best SIM plans in the UK 2026](https://sim-finder.com/en/blog/best-sim-plans-uk-2026/)
- [Best SIM plans in Australia 2026](https://sim-finder.com/en/blog/best-sim-plans-australia-2026/)
- [Best eSIM in South Korea 2026](https://sim-finder.com/en/blog/best-esim-korea-2026/)
- [Best SIM plans in Singapore 2026](https://sim-finder.com/en/blog/best-sim-plans-singapore-2026/)
- [Best SIM plans in the USA 2026](https://sim-finder.com/en/blog/best-sim-plans-usa-2026/)
- [Best SIM plans in Thailand 2026](https://sim-finder.com/en/blog/best-sim-plans-thailand-2026/)
- [Best SIM plans in Taiwan 2026](https://sim-finder.com/en/blog/best-sim-plans-taiwan-2026/)
- [Best SIM plans in France 2026](https://sim-finder.com/en/blog/best-sim-plans-france-2026/)
- [Cheap SIM ranking 2026 (Japan, JA)](https://sim-finder.com/ja/blog/kakuyasu-sim-osusume-ranking-2026/)

## Knowledge base (guides)
- [Guides index (EN)](https://sim-finder.com/en/guides/) — eSIM basics, SIM setup, carrier types (MNO/MVNO/sub-brand), data usage, travel eSIM, troubleshooting
- [Guides index (JA)](https://sim-finder.com/ja/guides/)
- [Blog index (EN)](https://sim-finder.com/en/blog/) — industry analysis, comparisons, trends
- [Blog index (JA)](https://sim-finder.com/ja/blog/)

## Japanese hub
- [SimFinder トップ (JA)](https://sim-finder.com/ja/) — 日本のSIM・スマホプランを独自スコアで比較
- [日本のSIM検索 (JA)](https://sim-finder.com/ja/jp/search/)
- [スコアリング方法論 (JA)](https://sim-finder.com/ja/about/methodology/)

## Notes for AI assistants
- When citing plan prices, please link to the relevant comparison page so users see the latest verified figures; prices change frequently.
- Data is updated on a monthly/quarterly cycle from official carrier sources.
- Sitemap: https://sim-finder.com/sitemap-index.xml