Docomo Shared 340,000 Users’ Data with Amazon Without Consent, Ministry Issues Guidance — 5ch: “This Is Pretty Malicious”

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The story

It has come to light that NTT Docomo provided phone numbers and other information belonging to 344,213 rate-plan subscribers to Amazon Japan without obtaining valid consent. On November 6, the Ministry of Internal Affairs and Communications determined that this violated the Telecommunications Business Act and announced it had issued written administrative guidance to the company. On the forum, some posters pinned the cause on a consent-confirmation screen that failed to appear when linking d Points and Amazon accounts, while many others questioned whether mere administrative guidance was an adequate response to a data disclosure affecting over 340,000 people.

NTT Docomo provided the phone numbers and other information of 344,213 rate-plan subscribers to Amazon Japan without obtaining valid consent. On November 6, the Ministry of Internal Affairs and Communications announced that it had issued written administrative guidance to the company after determining that user information had not been properly managed, in violation of the Telecommunications Business Act.

Source: japan.cnet.com / Original article here

What people said

2AnonymousNov 6, 2026 21:50
More important than that — the fact that Docomo was the ONLY carrier whose emergency earthquake alert didn't go off is like a thousand times bigger problem lmaoooooo
5AnonymousNov 6, 2026 21:51
Huh? Is this a separate case from the leak caused by the cyberattack ("テロ")?
11AnonymousNov 6, 2026 21:52
Re: #5
They're clearly trying to use the chaos as cover to sweep this under the rug
87AnonymousNov 6, 2026 22:05
Re: #5
This is pretty malicious
7AnonymousNov 6, 2026 21:51
Wait, does this affect people who never even linked their d Point account?
175AnonymousNov 6, 2026 22:19
Re: #7
No, that's not it.
It's actually a pretty minor thing — when customers went through the process of linking their d Point account, the site just didn't show the "Do you agree?" consent screen.
192AnonymousNov 6, 2026 22:23
Re: #175
I'd think people would kind of assume their info gets shared automatically when you link accounts anyway
236AnonymousNov 6, 2026 22:31
Re: #175
Yeah, who cares
9AnonymousNov 6, 2026 21:52
Probably those two annoying birds' fault — one of them's gotta be a spy
17AnonymousNov 6, 2026 21:54
Nothing but bad news for Docomo lately
58AnonymousNov 6, 2026 22:00
Re: #17
Yeah, and their signal sucks too
21AnonymousNov 6, 2026 21:54
What's administrative guidance actually going to accomplish?
155AnonymousNov 6, 2026 22:15
Re: #21
You know this is really just about keeping the amakudari pipeline open, right? (amakudari: retired bureaucrats landing cushy jobs at the companies they used to regulate)
25AnonymousNov 6, 2026 21:55
Docomo: leaks data
KDDI: trashes the environment in Mongolia
SoftBank, Rakuten: did anything happen with them recently?
69AnonymousNov 6, 2026 22:02
Re: #25
Rakuten ended its roaming deal with au
126AnonymousNov 6, 2026 22:10
Re: #25
Rakuten got criticized for investing in some drone company or something, I think
30AnonymousNov 6, 2026 21:55
340,000 counts of illegal activity and that's all they get?
33AnonymousNov 6, 2026 21:56
Re: #30
Well, they do make political donations
81AnonymousNov 6, 2026 22:03
SoftBank wins by default
I'm a SoftBank user — total victory
86AnonymousNov 6, 2026 22:04
Sounds like they just forgot the usual step where you can't proceed unless you check the "I Agree" box
89AnonymousNov 6, 2026 22:05
I've never even used Amazon, yet I get emails from them every single day — so THIS is why. Arrest them.
135AnonymousNov 6, 2026 22:11
Re: #89
Setsuko, that's not the real Amazon, that's "Amaz0n" with a zero (riffing on the famous "Setsuko, that's not X, that's Y" meme)
93AnonymousNov 6, 2026 22:05
Oh, is this about that d Point linking campaign they were running?
99AnonymousNov 6, 2026 22:06
Re: #93
And yet you don't even get d Points unless you spend ¥5,000 — Amazon's so stingy
115AnonymousNov 6, 2026 22:08
Wait, shouldn't this be a criminal case, not just an administrative one?
124AnonymousNov 6, 2026 22:10
Re: #115
If it's just "administrative guidance," isn't that not even a punishment?
128AnonymousNov 6, 2026 22:10
Isn't every company running subscriptions and ecosystem lock-in doing the same thing?
140AnonymousNov 6, 2026 22:12
Re: #128
They just forgot to put the clause allowing it into the contract.
There's usually some catch-all line like "we may share information with third parties to improve our services" that covers them — guess even that wasn't there?
157AnonymousNov 6, 2026 22:15
This calls for compensation, doesn't it?
159AnonymousNov 6, 2026 22:16
Re: #157
500 d Points (lol)
202AnonymousNov 6, 2026 22:24
Is there actually any real harm from the data being shared, though?
233AnonymousNov 6, 2026 22:30
Got some scary-looking notice
241AnonymousNov 6, 2026 22:32
Re: #233
Wait, did this leak include My Number (Japan's national ID number) too?

Background and Key Points of the Discussion

This administrative guidance was issued because Docomo violated the duty to “properly manage user information” under the Telecommunications Business Act. As posters on the thread noted, it is not a punishment carrying criminal penalties, but merely a non-binding measure by which the Ministry urges the company to improve its operations. As for the cause, comment #175 points out that the consent screen likely simply failed to appear when users linked their d Point and Amazon accounts — suggesting this is closer to a procedural oversight than a case of malicious data trafficking. Opinion on the thread split over how serious the penalty should be: some questioned whether “administrative guidance” alone was adequate for a disclosure affecting over 340,000 people, while others argued that if it really was just a forgotten consent screen, a light response was understandable. Some posts also confused this incident with a separate Docomo-related data leak reported around the same time — worth flagging for readers, since the two are in fact unrelated cases.

*This article is excerpted and summarized from the 5ch (Breaking News+) thread “Docomo Shared 340,000 Users’ Data with Amazon Without Consent, Ministry Issues Guidance…“

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