Moving to a new home in Japan is exciting, but it comes with a checklist — and one item that's easy to overlook is updating your address with your mobile provider. If you need to change your address on your mobile plan in Japan as a foreigner, this guide walks you through exactly what to do, what documents you'll need, and what to watch out for.
Why Updating Your Mobile Address Matters
In Japan, your registered address on your mobile contract must match your official residence record. Carriers and MVNOs (smaller virtual network operators) use this address for billing, identity verification, and sending important notices. If your address is out of date, you may miss contract paperwork, face verification problems, or run into trouble if you ever need to upgrade your plan or dispute a charge.
There's also a practical immigration reason: your residence card address should always be current, and your mobile provider's records should reflect that too.
Step 1 — Update Your Residence Card First
Before you contact your mobile provider, make sure you've already updated your official address at your local city or ward office (shiyakusho or kuyakusho). By law, you must report a change of address within 14 days of moving. Bring your residence card and your new address details. The office will update the address printed on the back of your residence card on the spot.
This step is important because most mobile providers will ask to see your updated residence card as proof of your new address.
Step 2 — Gather the Documents You'll Need
The exact requirements vary by provider, but you will typically need:
- Your residence card with your new address already updated on the back
- Your contract phone number or customer account number
- Access to your registered email address or online account (for online updates)
- Your registered name exactly as it appears on your contract
Some providers may also ask for a secondary form of ID. Always check the official site of your specific provider for the most current requirements, as these can change.
Step 3 — Choose How to Update Your Address
Most providers in Japan offer two or three ways to make this change. Here's a general overview:
| Method | How it works | Best for |
|---|---|---|
| Online (My Page / app) | Log in to your provider's customer portal or app and update your address in your account settings | Most people — fastest and easiest |
| In-store visit | Visit a carrier shop or MVNO partner shop with your documents and update in person | If you're not comfortable online or have questions |
| Phone / customer support | Call the provider's support line and request an address change verbally or via a mailed form | If online access is unavailable |
For most people, the online method via the provider's app or website is the quickest. That said, if your Japanese is limited, an in-store visit can sometimes be easier because staff can guide you through the process face to face.
Step 4 — Update by Provider Type
Major Carriers (docomo, au, SoftBank)
Each of the big three carriers has an online "My Page" customer portal where you can update your registered address after logging in. You may be asked to upload a photo of your updated residence card as verification. If you visit a shop in person, bring your residence card and be prepared for some paperwork in Japanese. Translation apps on your phone can help, but consider bringing a Japanese-speaking friend if possible.
Foreigner-Friendly MVNOs (GTN Mobile, Mobal, and others)
If you're on a foreigner-friendly MVNO like GTN Mobile or Mobal, the process is often smoother. These providers typically offer multilingual customer support and are accustomed to helping foreign residents with exactly this kind of update. GTN Mobile, for example, provides support in multiple languages and accepts your residence card as the primary ID document. Check their official websites or contact their support team directly — they are set up to help you.
Prepaid SIMs
If you're on a prepaid SIM, address registration requirements vary. Some prepaid SIMs don't require a registered address at all, while others do. Check your specific provider's terms to see if an update is needed.
What to Expect After You Submit the Update
Processing times vary by provider. Online updates are sometimes reflected immediately, while others can take a few business days. Some providers will send a confirmation to your registered email address once the change is complete. If you don't receive confirmation within a week, follow up with the provider's customer support.
There is generally no fee for changing your registered address, but confirm this with your provider as policies can change.
Tips for Foreign Residents Navigating This Process
- Update your residence card address first — providers won't accept an address that doesn't match your current official record.
- Take clear photos of both sides of your residence card before your appointment or online submission — you may need to upload them.
- Use your provider's app or English-language support where available to reduce language barriers.
- Keep a record of your update request — screenshot the confirmation page or note the date you called.
- If you're considering switching providers when you move, this can be a good opportunity to compare plans. Foreigner-friendly options like GTN Mobile and Mobal may suit your needs well, especially if a Japanese credit card or bank account is something you're still setting up.
Summary: Keeping Your Mobile Records Up to Date After Moving
Changing your address on your mobile plan in Japan as a foreigner is a straightforward process once you know the steps. Start at your local government office to update your residence card, then contact your mobile provider — online, in-store, or by phone — with your updated ID in hand. Foreigner-friendly providers like GTN Mobile and Mobal make this especially manageable with multilingual support.
Don't let this task slip to the bottom of your moving checklist. Keeping your records accurate protects you from missed notices and verification headaches down the line. You've already handled the hard part of moving — this is one more step towards settling in smoothly. You've got this.
Note: Specific requirements, processing times, and fees vary by provider and may change. Always confirm the latest details directly on your provider's official website.