Choosing a Mobile Plan in Japan
Choose by residence card, passport, Japanese payment method, coverage, voice number, eSIM, MNP, device installments, and cancellation rules.
The first question for a phone plan in Japan is not price. It is whether the applicant can pass identity and payment checks. A regular contract usually needs a residence card, passport, and Japanese bank account or Japan-issued credit card. Without those, a tourist SIM, prepaid SIM, or eSIM is the practical bridge.
Three layers of plans
The major carriers are docomo, au, and SoftBank. Monthly cost often sits around ¥7,000 to ¥10,000, but coverage, shop support, and rural reliability are strongest. People who travel through mountains, small towns, or construction sites still often choose a major carrier.
The sub-brands and online brands are ahamo, povo, and LINEMO. They use the main carrier networks and commonly cost around ¥2,700 to ¥3,300 for mid-sized data plans. ahamo is on docomo and includes 20GB for ¥2,970 with short domestic calls; povo 2.0 has ¥0 base fee plus paid toppings; LINEMO has 3GB for ¥990 or 20GB for ¥2,728.
MVNO and low-cost brands such as IIJmio, mineo, NURO Mobile, y!mobile, and UQ mobile can fall around ¥880 to ¥2,500. They fit low-data users, but voice calls, payment method, store support, and lunchtime speed need checking before signing.
Source: Ministry of Internal Affairs and Communications: MVNO consumer information, Consumer Affairs Agency: Mobile contracts.
Documents and payment checks
For a normal long-term contract, bring the original residence card, passport, Japanese bank account, or Japan-issued credit card. Overseas Visa or Mastercard cards often fail carrier or MVNO payment checks, even when they work at shops.
Japan Post Bank and MUFG accounts are common early options, while Rakuten Card and PayPay Card are often tried by foreign residents after address and phone records are stable. Name spelling must match across residence card, bank, and carrier account; a middle-name mismatch can block automatic debit.
When a regular contract is not possible, airport tourist SIMs from providers such as IIJmio, IHY, or b-mobile cover 7 to 30 days and often cost ¥1,500 to ¥5,000. They are usually data-only. eSIM works on many iPhone and Android models through ahamo, docomo, LINEMO, and travel-SIM providers.
Source: JNTO: SIM cards and pocket Wi-Fi.
Voice number versus data-only SIM
Long-term residents should usually choose a plan with a Japanese voice number starting 090, 080, or 070. Banks, school systems, company HR systems, delivery accounts, and some municipal services often expect SMS verification from a Japanese mobile number.
A data-only SIM can be fine for a 2-week trip, a tablet, or a second phone, but it cannot receive standard voice calls and may not receive the SMS needed for bank or employment workflows. A cheap data-only plan can therefore become expensive when it blocks account opening or payroll setup.
If the plan includes voice, confirm call pricing. Many low-cost plans charge around ¥11 to ¥22 per 30 seconds unless a call pack is added. ahamo includes short domestic calls, while povo and MVNO plans often sell call toppings separately.
Cancellation and MNP after 2021
After 2021 regulatory changes, major 2-year cancellation penalties were largely removed. In practice, the bigger remaining cost is often the device installment. If the phone itself was bought in 24 or 36 installments, the remaining balance still has to be paid after carrier change or cancellation.
MNP, mobile number portability, lets a person keep the same phone number when changing carriers. The process starts with an MNP reservation number or an online one-stop transfer when supported, then finishes at the new carrier. A simple online transfer can take about 30 minutes, but identity mismatch can turn it into a shop visit.
povo 2.0 has a special trap: the base fee is ¥0, but the line can be suspended or cancelled if no paid topping is bought for 180 days. Buying a small ¥220 call topping every 6 months is a common maintenance tactic for a backup number.
Source: Consumer Affairs Agency: Mobile phone contract warnings.
Practical choices
For the first month after arrival, use an airport tourist SIM or eSIM while opening a bank account and stabilizing address records. A data-only bridge is acceptable during this period because bank and HR procedures have not fully started yet.
For long-term city life under 10GB, IIJmio or NURO Mobile with voice can keep monthly cost around ¥1,300 to ¥1,500. For stable voice and docomo coverage, ahamo at ¥2,970 for 20GB is a simple middle route.
For very low usage, povo 2.0 works if toppings are managed. For rural movement, major docomo is still the safer coverage choice because au and SoftBank can weaken in some mountain or remote areas.
Common mistakes
Going straight to a long-term contract with only overseas cards can fail at monthly payment screening. Use a tourist SIM or eSIM first, then move to a regular contract after address, bank account, and Japan-issued card are stable.
Using a data-only SIM as the main long-term line can block bank, employer, and delivery SMS verification. Long-term residents should prioritize a 090, 080, or 070 voice number.
Changing carriers without checking device installments leaves 24- or 36-month phone payments even when cancellation penalties are gone. Before MNP, check device balance, SIM lock, and exact account name.
Useful terms
- 格安 SIM: low-cost SIM service
- MNP: mobile number portability
- 本人確認: identity verification
- 解約金: cancellation fee
- eSIM: embedded digital SIM