How to Choose a SIM Card in Japan as a Foreigner [2026 Guide]

For foreigners who have just arrived in Japan, setting up a smartphone is one of the first major hurdles. This article explains Japan’s SIM landscape and the key points foreigners should check before choosing a plan.

■ Japan’s SIM Landscape: Major Carriers vs. Budget SIMs

Japan’s mobile market is broadly divided into two categories: major carriers and budget SIMs (MVNOs).

The three major carriers are NTT Docomo, au, and SoftBank. They offer reliable network quality and strong customer support, but monthly fees tend to be high and the sign-up process can be complicated.

Budget SIMs offer lower monthly rates and many can be set up entirely online. However, call quality and available languages vary, so choosing the right one matters.

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■ 5 Key Things Foreigners Should Check When Choosing a SIM

・Point 1: Can foreigners actually sign up? Some SIM providers in Japan do not accept foreign applicants, or have a very complex sign-up process. Always confirm whether you can apply with a Residence Card or passport.

・Point 2: Is support available in your language? If customer support is only in Japanese, you may run into trouble when issues arise. Check whether English or multilingual support is available.

・Point 3: Domestic call and international call rates You will need to stay in touch locally, as well as with family back home. Check whether international calling options are available and how much they cost.

・Point 4: Data quality and data allowance Smartphones are used constantly in Japan — on trains, in cafes, everywhere. Compare data speeds, allowances, and what happens after you hit the limit.

・Point 5: Monthly cost and contract lock-in terms Choose a plan that fits your budget, and confirm whether there is a minimum contract period. If you are on a short stay, look for a plan with no lock-in.

■ Why Foreigners Choose Rakuten Mobile

Rakuten Mobile covers all five of the points above.

・Foreigners can apply with a Residence Card and a credit card ・The entire process can be completed online — no need to visit a store ・Monthly fees adjust automatically based on data usage, with a simple and transparent plan (up to ¥3,278/month) ・Unlimited domestic calls when using the dedicated Rakuten Link app ・eSIM support — get connected on the day you arrive in Japan

■ Summary

When choosing a SIM in Japan, focus on three things: “Can I sign up?”, “Is there adequate support?”, and “Is the price reasonable?” Rakuten Mobile checks all these boxes while offering excellent value for money.

━━━━━━━━━━━━━━━━━━━━━━ 🎁 Sign up for Rakuten Mobile here

Get bonus points when you sign up via our referral link! ・MNP (number transfer) → 14,000 points ・New contract → 11,000 points

▶ View campaign details here https://r10.to/hFd3ot ━━━━━━━━━━━━━━━━━━━━━━

※ Information in this article is current as of June 2026.