“Major carriers” and “budget SIMs.”
Can you actually explain the difference?
I think many people understand it as little more than “the prices are different.”
But the real difference is whether a company owns its network or rents it.
Bottom line: an MNO owns the road, an MVNO rents the road and runs on it
- MNO (Mobile Network Operator): a company that owns its own network, such as base stations, and provides service
- MVNO (Mobile Virtual Network Operator): a company that rents an MNO’s network and provides service
Here’s the road analogy.
An MNO is a company that builds and maintains its own road.
An MVNO is a company that rents that road and runs buses on it.
The bus fare can be cheaper because there’s no cost to build a road yourself.
What each one is like
MNO
- Builds out its own base stations. So it can control coverage and quality itself
- Keeping the equipment up costs money
- The well-known ones are Docomo, au, SoftBank, and Rakuten Mobile
MVNO
- Without its own equipment, it can keep prices down more easily
- It can be affected by congestion on the network it rents. For example, you sometimes hear about slowdowns around lunchtime
- IIJmio and mineo are known as MVNOs
Neither is better or worse. It’s a difference in what you prioritize.
Rakuten Mobile is an MNO
Rakuten Mobile is an MNO that builds out its own network.
However, during the buildout, it has borrowed other companies’ networks to fill the gaps. This is roaming (partner network).
The former KDDI (au) roaming arrangement ended at the end of September 2026. I go through it in another article.
An MNO has to keep building out its own road. The fact that Rakuten Mobile is putting effort into base station buildout and using the platinum band is probably because of this background (this is my take). I explain it in the platinum band article.
How to choose
Who an MNO suits
- People who value stable connections
- People who worry about signal indoors or in the suburbs
- People who want in-store support
Who an MVNO suits
- People who want to keep their monthly cost as low as possible
- People who use little data and only in limited places
- People who can handle the paperwork online by themselves
If you can’t decide, first check whether you actually get signal where you live and move around. You can check coverage on each company’s official map.
I have an article comparing the differences between carriers, too.
Summary
- An MNO is a company with its own network. An MVNO rents it and provides service
- An MVNO can keep prices down more easily because it has no equipment of its own
- Rakuten Mobile is an MNO with its own network (it has used other companies’ roaming during the buildout)
- When choosing, look beyond price to signal in your area, support, and how easy the procedures are
Instead of “major or budget,” think “own the road or rent it,” and the difference gets easier to see.
For Those Considering Rakuten Mobile
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