Rakuten Mobile Faces Moment of Truth as KDDI Scales Back Roaming Deal, Base Station Rollout Lags

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The story

At the end of September, Rakuten Mobile will lose part of its “roaming” agreement to borrow signal from KDDI. For Rakuten, which has relied on rival networks in areas where its own base station buildout hasn’t kept pace, this marks a make-or-break moment on the road to going it alone. The thread lit up with a report that an au store had posted a sign saying “roaming to Rakuten ends in this area,” along with the latest subscriber numbers for docomo, au, SoftBank, and Rakuten — and opinion split over how to weigh cheap rates against a spottier connection.

Delivered 9/29 (Tue) 7:05 AM

Jiji Press

Rakuten Mobile, a Rakuten Group subsidiary, will have part of its “roaming” agreement to borrow KDDI’s mobile network terminated in some areas at the end of this month.

Source: news.yahoo.co.jp / Original article here

What people said

4AnonymousSep 29, 2026 08:34
The smear campaign against Rakuten Mobile never stops, huh.
Works fine for me and it's cheap — I don't have that many complaints.
8AnonymousSep 29, 2026 08:37
Re: #4
But it might stop working fine soon.
70AnonymousSep 29, 2026 09:01
Re: #4
Lucky guy…
10AnonymousSep 29, 2026 08:37
au stores have started smearing Rakuten directly now.
They put up a map in the store saying "signal lending to Rakuten has ended in this area"
and tell customers to switch carriers.
73AnonymousSep 29, 2026 09:03
Re: #10
Seriously?
That's blatant.
They must have really hated lending out signal.
99AnonymousSep 29, 2026 09:13
Re: #10
These stores are run by disposable temp staff anyway
— it's all about contract numbers for them.

I don't need a store since Povo is enough for me. (Povo: KDDI's low-cost, app-only SIM plan)
15AnonymousSep 29, 2026 08:39
I'm not worried — just bump it to 200 shares for the shareholder perk and the stock's at 1,200 yen.
39AnonymousSep 29, 2026 08:50
Re: #15
The perk could get scrapped and the stock could drop to 300 yen too.
25AnonymousSep 29, 2026 08:44
Wanting big-carrier-level profits without doing the capital investment is just shameless.
31AnonymousSep 29, 2026 08:47
Re: #25
Roaming exists for rural areas where building your own infrastructure costs a fortune for zero benefit — using roaming there is actually the more financially stable choice.
27AnonymousSep 29, 2026 08:46
Does Rakuten really have worse coverage than docomo?
35AnonymousSep 29, 2026 08:47
Re: #27
At my parents' place out in the suburbs, Rakuten's straight up out of range
— and it's technically a regional city too.
Though I think Rakuten's fine if you're just using it for data at home.
30AnonymousSep 29, 2026 08:46
Re: #1
You're mixing up the au/KDDI roaming (platinum band) story with the 5G story.
38AnonymousSep 29, 2026 08:50
Re: #30
Typo on my part — I meant low-frequency and high-frequency bands.
40AnonymousSep 29, 2026 08:50
I figured they'd extend the au roaming deal at the last minute, but they're really cutting it, huh.
44AnonymousSep 29, 2026 08:52
Re: #40
And they're giving up on that not-so-cheap roaming fee too.
42AnonymousSep 29, 2026 08:51
I used to do sales for Rakuten base stations — going it alone is pretty tough.
Building owners tend to sign with multiple carriers, but once you're the 4th carrier, it gets messy and owners tend to balk.
77AnonymousSep 29, 2026 09:06
Just looked it up.



Is this going to go bad too?
82AnonymousSep 29, 2026 09:07
Re: #77
If you're connecting on Rakuten's own network, it should stay the same
— this is about the partner network shrinking.
84AnonymousSep 29, 2026 09:08
Re: #77
That's a Rakuten-owned area, so nothing changes there.
88AnonymousSep 29, 2026 09:09
Does it even work out in the countryside?
Re: #77
With this you wouldn't even need fiber-optic broadband.
107AnonymousSep 29, 2026 09:15
Why did they ever get into the phone business…
109AnonymousSep 29, 2026 09:17
Re: #107
Mikitani's "gotta have everything" syndrome flared up again. (Hiroshi Mikitani, Rakuten's founder/CEO)
121AnonymousSep 29, 2026 09:20
Re: #107
They judged that running their own mobile network (MNO) was essential to complete the ecosystem tying together e-commerce, fintech, and telecom.
Every other company's doing the same thing now, but
Rakuten's execution is a cut or two above the rest.
I was skeptical for years myself, but they've passed 11 million lines now
— I think in the long run this'll turn out to have been the right call.
126AnonymousSep 29, 2026 09:22
Re: #107
"Why" — because once this turns profitable, the money's absurd. Anyone saying to cut losses on the mobile business doesn't understand economics.
137AnonymousSep 29, 2026 09:26
Honestly, it's not even that cheap.
143AnonymousSep 29, 2026 09:30
Re: #137
Rakuten Mobile's Mikitani: "Honestly, having people use it for free forever would be a problem for us."
https://k-tai.watch.impress.co.jp/docs/news/1409103.html
234AnonymousSep 29, 2026 10:12
Re: #137
The unlimited plan is godly, but the other plans aren't especially cheap.
Though there is something nice about not having to worry no matter how many GB you use since it's a flat rate.
160AnonymousSep 29, 2026 09:42
Don't know much about it, but is it that docomo, SoftBank, and KDDI have the whole country's network locked up so there's no room for a newcomer?
170AnonymousSep 29, 2026 09:46
Re: #160
The low-frequency "platinum band," which can penetrate into buildings, is monopolized by the three major carriers, and every other usable frequency is already allocated to something — so there's no way to hand any to Rakuten. For reference, back when SoftBank didn't have a platinum band, they even paid to have other frequencies relocated just to secure one.
174AnonymousSep 29, 2026 09:47
Re: #160
Didn't Rakuten get a government subsidy to try a Japanese version of Starlink?
If that pans out, they might be able to compete on equal footing with a whole new kind of network.
191AnonymousSep 29, 2026 09:56
Isn't KDDI the one in trouble here?
Rakuten's actually gotten pretty decent at connecting these days.
(Though at big hospitals and places like that, I sometimes get "no signal" while everyone around me is on a call fine.)
193AnonymousSep 29, 2026 09:58
Re: #191
The same Rakuten that says "you're offline" when you try to pay at checkout?

Rakuten has no standing to say anything about KDDI.
197AnonymousSep 29, 2026 10:00
Re: #191
au's been on a winning streak lately, so they probably don't want to keep lending roaming coverage to Rakuten for downtown subway tunnels and shopping complexes.

NTT docomo……91,291,800 lines (-1,784,600)
au (KDDI etc.)……73,814,300 lines (+1,053,700)
SoftBank……57,019,700 lines (+99,600)
Rakuten Mobile……10,750,000 lines (+390,000)
235AnonymousSep 29, 2026 10:12
Just like cheap-and-good-enough eventually ate into Japan's high-quality-everything market,
Rakuten is going to keep chipping away share from the big three high-quality carriers.
Once it clears 15% share, you could call it the "big four" carriers.
It's at 10% now.

Look at how expensive everything's gotten these days and it's obvious what ordinary people are thinking.
238AnonymousSep 29, 2026 10:14
Re: #235
It's still in the 3% range though…
241AnonymousSep 29, 2026 10:15
Re: #235
Their quality's only been decent because they were piggybacking on other carriers' networks — once they actually have to invest in infrastructure themselves, they won't be able to keep prices low. Isn't that game over?

Background and key points of this discussion

Rakuten Mobile’s roaming setup lets it borrow KDDI’s network in areas its own base stations don’t yet reach, and this round of cuts affects only part of that coverage area. The thread shows both anxiety — “is coverage really going to disappear?” — and shrugs from users who say they’ve never noticed a problem, revealing just how much the experience varies by person. There’s also a point about pricing: Rakuten’s unlimited plan is a genuine standout, but commenters note its other plans aren’t dramatically cheaper than rivals’, so the blanket “Rakuten = cheap” image can be misleading. The power dynamic between the carrier borrowing base stations and the one lending them — and the fact that an au store’s in-store notice effectively doubles as a sales pitch — hints at maneuvering within the industry that goes beyond a simple contract change.

*This article is excerpted and summarized from the 5channel (News Speed+) thread “[Mobile Phones] Rakuten Mobile Faces Moment of Truth Toward Independence as KDDI Scales Back Network Lending, Base Station Buildout Lags Behind Rivals.”

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