Switching from Sakura Mobile to ahamo: When and How

Sakura Mobile solves a real problem: a working Japanese number with English support, before you have a bank account, a credit card, or six months of residency. That’s worth paying for when you land.

It stops being worth paying for once you’ve built the things it doesn’t require. At that point, a carrier budget plan like ahamo gives you more data for roughly half the money [VERIFY current gap, ahamo ¥2,970/30GB vs comparable Sakura plan]. This guide is the switch, start to finish.

Full disclosure: this site has applied to Sakura Mobile’s affiliate program, and we’re still telling you to leave when the time is right. That’s the arrangement we have with readers. [Update this line at publication.]

[EGE: your own switch story, or your current Sakura/carrier situation, honestly stated.]

Are you ready to switch?

ahamo (docomo’s online-only brand) needs everything Sakura didn’t ask for:

• Residence card with decent validity left [VERIFY minimum]
• A Japanese bank account or Japanese credit card
• Tolerance for a mostly-Japanese signup flow [VERIFY current English support]
• A SIM-unlocked phone (bought abroad: almost always fine)

Missing one? Stay on Sakura for now. The guide will still be here, and the savings compound from whenever you start.

What do you save?

[VERIFY and build small dated table: Sakura long-term plan vs ahamo ¥2,970/30GB vs LINEMO and povo equivalents, monthly and yearly. Make the yearly number prominent.]

The switch, step by step

1. Get your MNP number from Sakura

MNP (番号ポータビリティ) moves your phone number with you. No new number, no updating every account you own. Ask Sakura support for an MNP予約番号 (MNP reservation number) [VERIFY Sakura’s procedure, any MNP-out fee, final-month billing].

Timing note: the number expires in about 15 days [VERIFY], so don’t request it until you’re ready to use it.

2. Sign up at ahamo with that number

On ahamo’s site, pick 乗り換え (MNP), not a new number. Have ready:

• Residence card photos for the eKYC camera dance
• Your Japanese bank account or credit card
• Five minutes to create a d-account (docomo’s login system, made during the flow)

[VERIFY current eKYC steps and typical approval time]

3. Activate; the cutover is automatic

The moment your ahamo SIM or eSIM goes live, your number moves and the Sakura SIM dies. No gap, and no separate cancellation of the line itself [VERIFY whether Sakura requires any contract-closure step after MNP-out]. eSIM is fastest. A physical SIM adds shipping days during which you’re paying both providers [VERIFY overlap billing].

4. Check the paper trail

Confirm the final Sakura invoice closed clean. Everything tied to your number keeps working (LINE, banking apps, SMS codes) because the number never changed. That’s the entire point of MNP.

What are the gotchas?

• English support ends. This is the real price. ahamo support is chat-based, in Japanese [VERIFY]. For most people that’s a translation-app inconvenience twice a year. Know yourself.
• Voicemail is extra or absent on budget plans; tethering is included on ahamo [VERIFY both].
• Don’t request the MNP number early. It expires, and re-requesting is friction you don’t need.

Is ahamo the only option?

Same prerequisites, different flavors: LINEMO (SoftBank), povo (au, pay-as-you-go top-ups), Rakuten Mobile (cheapest at low usage, coverage still the question) [VERIFY current plans]. If your Japanese is improving, comparison-shop. If you want the safe default everyone’s coworker uses, ahamo is fine.

Can you switch back if you hate it? Yes. MNP works in both directions, including back to English-support providers.

Should new arrivals skip Sakura and go straight to ahamo? Usually impossible: no Japanese bank or credit card, no ahamo. Land on English support, build the prerequisites, then switch. That’s the standard path, and this is the map.

Set a calendar reminder for your six-month mark. Future-you will actually do the switch if present-you schedules it.