Take our user survey here!

Cutting the Contract: A Guide to Setting Up a SIM-Free Phone in Japan

Getting your monthly phone bill to as low as ¥2,000 is now an actual possibility in Japan — just be sure to read the fine print.

By 5 min read 5

I’m not a big fan of Japan’s larger telecom companies. Prices seem grossly inflated, competition is almost non-existent and getting out of the contract once you are locked in is almost impossible.

However, things have been looking up recently.

In May 2015, a small but significant change was made to the telecoms law. As of that date, any phone bought on a contract in Japan could, at the customer’s request, be unlocked after a period of six months. Suddenly, switching networks became even cheaper and easier. This has, in a relatively short space of time, lead to a boom in the MVNO sector in Japan.

The rise of MVNOs

A mobile virtual network operator, or MVNO, is basically a company that provides access to mobile networks but doesn’t own its own network. In other words, it pays a larger provider for access to the network infrastructure and then negotiates its own contract with the customer. Given that MVNOs run with far less expensive overheads than traditional mobile networks, they can, for the most part, offer cheaper deals to the customer.

A typical “calls and data” combination on AU, Softbank or Docomo will run between ¥7,000 and ¥10,000 per month — depending on the amount of data and the model of phone you have signed up for. As an example, the MVNO contracts I have looked at — which do not include call time or a phone — come in at between ¥3-5,000 per month for unlimited data. However, if you can get by with just 3GB or 5GB of data per month, then in some cases this can go as low as ¥1,000 or ¥2,000 per month.

However, if you can get by on just 3GB or 5GB of data per month then in some cases this can go as low as ¥1,000 or ¥2,000 per month.

What to consider?

There are a few important things to consider before you put pen to paper on that deal, though.

First, is your current phone more than 18 months old? If so, then your current network will most likely refuse to unlock it for you. Even if they do agree to unlock it, you may still encounter compatibility problems. For example, I recently had my old AU phone unlocked by a private company. However, the phone still will not work with Docomo’s network or any of its adjoined MVNOs. This is simply down to the fact that their networks run on different frequencies.

Buying a SIM-free phone

The best thing to do, assuming you can afford it, is to just buy yourself a new smartphone. I recommend using an online shopping site like Amazon or Rakuten for this. A high-grade phone like an iPhone or Samsung Galaxy will typically cost around ¥50,000 or more. However, if you aren’t a slave to brands and trendy gimmicks then you can get some really good and fully functional phones in the ¥20-30,000 range, possibly even cheaper if you don’t mind getting a second-hand model.

As an example: I bought a six-month-old ASUS smartphone, with similar specs to my previous AU-locked model, the Galaxy Note 3, for just ¥18,000.

When looking for bargains, be careful, and I recommend only buying from Japanese suppliers. The staff at the MVNO booth in my local Yodobashi Camera told me that only factory unlocked, SIM-free phones bought in Japan are guaranteed to work on their networks. Overseas phones may work, but there are no guarantees in this regard.

As an example, I bought a six-month-old ASUS smartphone, with similar specs to my previous, AU locked model, the Galaxy Note 3, for just ¥18,000.

Signing up

In most cases, you will need a credit card to sign up. As I mentioned earlier, MVNOs offer cheaper prices by keeping operating costs down, and as such it’s much easier for them to take an automated credit card payment than to send you a bill to pay at 7-Eleven or another convenience store each month.

Pay attention to the speed and data limits on offer. Also, how much extra does it cost to make calls? As an example, U Mobile offers an unlimited data SIM card for just over ¥3,000 per month, however, calls cost an additional ¥30 per minute. So, it really depends on if you’re the type of person who makes a lot of calls, or if you’re ok calling through Skype, Line and so on.

Another area to consider carefully is the daily data limit. For example, while the aforementioned plan from U Mobile has no monthly data limit, the staff did warn me: “If you use more than 2 or 3GBs in one day, then the network might go slow for a while.”

This is a common practice around the world to prevent users abusing “unlimited” contracts. It is kind of annoying if it kicks in when you’re halfway through a movie on Netflix though!

There is also anecdotal evidence that in times of high traffic — for example early evenings or weekends — that MVNO networks tend to suffer more slowdown and connectivity issues than the established networks. This isn’t official, though, and could perhaps be explained through other means.

Finally, there’s still the issue of a contract. Yahoo Mobile insists on a two-year contract, which means they have many of the same handicaps as the major carriers. Other MVNO providers usually require a commitment of six months to one year depending on the type of contract.

The small print

Overall, moving to an MVNO is a bit like renting your own apartment in Japan: if you can afford the initial setup costs and you have the wherewithal to fill out all the Japanese paperwork, then you will almost certainly save substantial amounts of money. Some people, however, prefer the security of being with a bigger, more established firm. It really depends on your own financial situation. I certainly have no regrets about switching, but it’s only been a couple of weeks. Lastly, if you are thinking of going sim-free, always be sure to read the small print!

Finally, if you’re thinking of going SIM-free, always be sure to read the small print!


Leave a Reply

Your email address will not be published.

This site is protected by reCAPTCHA - Privacy Policy - Terms of Service

  • Skyee Saywer says:

    does this means that even if i unlocked my au galaxy s8+, i might not be able to use MVNO company like OCN sim card? OCN lends their network form docomo.

  • Ben Sake says:

    Will the MVNO’s take foreign credit or debit-check cards? How about bank information in lieu of a card? I heard they take direct bank-transfer payments if it’s a domestic bank — with the exception of Shinsei Bank because of some weird rules.

  • A bit more detail: That MVNO is almost certainly getting its data service from NTT, so if you have an UNLOCKED smartphone that can do the LTE 2100 band (used to be called WCDMA) then it will probably work. Google the phone you are thinking of buying used on Ebay beforehand. Check the band it does. Careful with unbranded $40 Chinese Phablets that claim WCDMA capability

    2) Are you on a work visa or just a tourist? Work visa folk can get Data + a voice number from some MVNO plans. Tourists have to stick to data only with ONE exception I’ll deal with last.

    If you are visiting for 1-2 weeks, get any throwaway data sim plan you like. 3 weeks or more, I recommend ASAHI NET only because I used then on 2 trips already, because they have English support staff, You can order your sim from abroad over the phone and pay with your heathen gaijin credit card and it will be shipped to your FRIEND IN JAPAN’s address where it will be waiting for you.

    Appx Y4000 for 1 or 2 months. Go Google their site, the details are a bit confusing but it works. I like that they don’t charge you for overage, they just drop the speed. Y3000 setup, Y900/month, 1st month free if you buy 2 months, return the sim when finished or pay a penalty

    If you are in Japan for work on a visa you can get an auxiliary phone number plan too, usual high per second rates. Was around Y1600-1800 last time I looked. No, I get no referral for this

    If you must have a “phone number” and you are a tourist, you hunt down an old flip phone of the carrier company you want to go with before hand. Then you show up at the airport kiosk for say SOFTBANK and shell out Y3000 cash to register (or was it Y3500?), show your passport and buy a Y3000 top up. Takes an hour. This is a PREPAID phone plan and tourist visa folks can get one. The minutes are good for 1 month of calls out, 2-3 month of calls in and stays alive for 14 months, so your next visit is cheaper. What a hassle. Wait till you try to find a used Japanese Softbank flip phone on Ebay, HAH! Have a friend loan your their mom’s old flip phone, but NOT TOO OLD. Check your intended co’s site. Unlocked heathen phones or phones that are not branded to the company will be rejected. I use Softbank because I used Softbank. Also this gives my coverage on the Softbank network and the NTT/ Docomo network (the data phone) If I absolutely need to get through somehow.

    I used to blog on this on a wordeepress site called myjapanesecellphone, but now lotsa other folks are getting most of it, so I cut back, but I still get the urge to fill in the blanks now and again.

    Have a fun time in Japan!

    • Voltron5150 says:

      Thank you for taking the time to write this article. Very informative and very helpful. I for one am tired of being extorted by the major carriers. There really is not much variance between the Big Three and the lack of deals with either. Same goes for just about anything in Japan since there’s very little price competition in a non-capitalism market. Time to free myself from the mobile provider shackles once my contract with Docomo ends. I’ll be givning them the finger. Any one who reads this and is with Docomo, after 6 months you can unlock your phone via Docomo’s site or in-store for ¥3,000. Save yourself some money and do it yourself. If you aren’t able to read the Docomo site, use Google page translate. Hope that helps. Then sell your phone at Geo, Amazon, Yahoo Auction, etc.

  • Gaurab Nakarmi says:

    So which company did you sign up with?



Surviving a Natural Disaster in Japan: An ALT’s Story

What is it like when disaster hits your home in Japan? Evacuated during the severe flooding of his adopted city, Joso, an ALT shares his story.

By 5 min read 7


This Week in Tokyo for Nov. 14 – Nov. 20, 2016

Every Monday we post our picks for upcoming events in Tokyo. If you would like your event listed here, contact the editor of GaijinPot.

By 1 min read


7 Ways to Say You Dislike Something in Japanese

Japanese and English have similar ways to say that you dislike something — as well as some fascinating differences.

By 3 min read