1
1,078円 /月
総合スコア: 86
Major Carrier (MNO) SIM Plans Comparison
Plans from Japan's four major carriers who own their network infrastructure. The best in coverage, speed stability, and customer support.
Nationwide coverage Stable peak-hour speeds In-store support 5G rollout leaders Family & bundle discounts
17 plans found
2
2,750円 /月
総合スコア: 83.66
3
2,178円 /月
総合スコア: 78.54
3,278円 /月
総合スコア: 76.57
3,850円 /月
総合スコア: 76.19
3,278円 /月
総合スコア: 71.07
4,378円 /月
総合スコア: 69.11
4,928円 /月
総合スコア: 66.38
4,268円 /月
総合スコア: 64.36
5,698円 /月
総合スコア: 63.66
5,478円 /月
総合スコア: 61.65
6,798円 /月
総合スコア: 56.19
6,578円 /月
総合スコア: 55.19
7,425円 /月
総合スコア: 48.44
8,008円 /月
総合スコア: 45.49
8,448円 /月
総合スコア: 45
8,228円 /月
総合スコア: 43.99
FAQ
What is the difference in network quality between major carriers and MVNOs?
Major carriers (MNOs) own their network infrastructure, allowing them to maintain stable speeds even during peak hours. MVNOs lease capacity from MNOs, which means they are more susceptible to speed throttling during congested periods. While geographic coverage is essentially the same, real-world speed consistency favors MNO direct subscribers.
Are there long-term contracts or cancellation fees with major carriers?
Most flagship plans from Japan's four major carriers now operate without mandatory contract terms. Following the 2019 law amendments that capped cancellation fees at ¥1,000, lock-in periods have been largely eliminated. Note that device installment plan balances may become due upon cancellation.
How does Rakuten Mobile compare to the other three major carriers?
Rakuten Mobile launched its own network in 2020 and is the newest MNO. Urban coverage has expanded significantly, but rural areas still lag behind Docomo, au, and SoftBank. Rakuten offers the lowest pricing with unlimited data and free calls via Rakuten Link. Checking coverage maps before subscribing is strongly recommended.