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Starting Work in Japan This April? Sort Out Your Phone Plan First

New workers in Japan need a local phone plan before day one — for commute apps, bank SMS codes, and company LINE groups. Here's what to do in 2026.

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Last verified: March 30, 2026 (JST)

Starting a new job in Japan is exciting and overwhelming in equal measure. Your first week means residency registration, bank accounts, commuter passes, and a dozen apps you've never heard of — and most of them need a working Japanese phone number.

Quick Answer: Get a proper Japanese phone plan before your first day of work. Tourist SIMs won't work for bank SMS verification or company LINE groups, and a local plan like Rakuten Mobile starts at just ¥1,078/month with no contract required.

Related guides: How to Sign Up for Rakuten Mobile (2025) | Rakuten SAIKYO Plan: Pricing & Features | Rakuten Mobile eSIM: Same-Day Activation

Get up to 13,000 points when you sign up → https://www.japanmobileguide.com/referral

Why Does Your Phone Plan Matter Before Day One?

The moment you start work in Japan, your phone becomes infrastructure. Your commuter pass app (Suica or PASMO via Apple Pay or Google Pay), route planning on Google Maps or Yahoo! Transit, and your company's LINE group all need a reliable connection.

More critically, almost every bank in Japan sends one-time SMS codes to verify your identity when you log in or make transfers. Without a Japanese number, you can't complete setup — and without a bank account, you can't receive your salary.

Tourist SIMs solve the data problem short-term, but most don't include a Japanese phone number at all, or provide one that doesn't work for SMS-based verification. They also get expensive: ¥3,000–¥5,000 per month is common for mid-tier tourist plans, before you hit any data cap.

What Does a Phone Plan Cost in Japan?

Japan's budget carrier market is genuinely competitive. Rakuten Mobile's SAIKYO Plan charges based on how much data you actually use:

Data usage Monthly cost
0–3GB ¥1,078
3–20GB ¥2,178
20GB+ (effectively unlimited) ¥3,278

There's no contract lock-in, which matters when you're new and still working out whether you'll stay long-term. Calls within Japan are free using the Rakuten Link app.

Most new workers end up in the ¥2,178–¥3,278 tier once they're commuting and streaming, but starting low while you find your feet is a real option.

When Should You Sign Up?

Ideally, before your first day — or at least within your first week. You'll need your Residence Card (在留カード), which you receive after completing residency registration at your ward or city office. That's usually your first errand after arriving in Japan.

With Rakuten Mobile, you can sign up entirely online in about 15 minutes once you have your Residence Card. eSIM activation is instant, so if your phone supports eSIM, you'll have a working Japanese number the same day you apply.

If your phone doesn't support eSIM, a physical SIM is mailed to your address and typically arrives within 3–4 business days.

Does Your Company Provide a Phone?

Some companies — particularly larger Japanese firms — provide a work phone. But that's a work phone: IT policies, potential monitoring, and the clear understanding that it isn't yours. Most people maintain a personal line alongside any company-issued device.

If your employer does hand you a phone, your personal plan becomes even lower stakes. You can sit at ¥1,078/month on Rakuten Mobile using minimal data, paying almost nothing while keeping your own number separate from work.

Are You Using Rakuten Mobile?

Rakuten Mobile is worth a close look if you're just getting started in Japan. Plans run from ¥1,078 to ¥3,278 based on actual usage — you're not paying for data you don't use. Everything from signup to billing is available in English, and customer support is reachable at 0800-805-0805. Sign up through a referral link and you'll earn up to 13,000 Rakuten Points — a useful cushion in your first month.

Get up to 13,000 points when you sign up → https://www.japanmobileguide.com/referral

Frequently Asked Questions

Can I keep using my home country SIM when I start work in Japan? You can for the first few days, but international roaming is expensive — often ¥1,000–¥3,000 per day depending on your carrier — and foreign numbers don't work for Japanese bank SMS verification. Switch to a local plan as soon as you have your Residence Card.

Do I need a Residence Card before I can sign up for a phone plan? Yes, for most carriers including Rakuten Mobile. You receive your Residence Card at the ward office when you complete residency registration, typically within your first few days of arriving in Japan.

What if I don't have a Japanese credit card yet? Rakuten Mobile accepts debit cards and bank transfer in addition to credit cards, so you're not blocked while you're waiting for your first Japanese credit card to arrive.

Can I keep my foreign phone number while using a Japanese SIM? You can't keep a foreign number active on a Japanese carrier, but many people use dual-SIM phones or a VoIP app (like Skype or Google Voice) to keep their home number reachable while running a Japanese SIM for day-to-day use.

Quick Reference

Topic Detail
Rakuten Mobile pricing ¥1,078 / ¥2,178 / ¥3,278 based on data usage
Contract required? No — cancel anytime
English support Website, app, and 0800-805-0805
Sign-up requirement Residence Card + payment method
eSIM activation Same-day if your phone supports eSIM
Referral bonus Up to 13,000 Rakuten Points

Sources

Referral Benefits