Japan’s Data and Voice SIM Providers Compared (Long-Term Options)

Greg Lane
Japan sim cards
Photo by Karl Baron used under CC

Investigating Japan SIM cards? If you balk at the enormous monthly fees and hidden charges of the big mobile players like NTT DoCoMo, Softbank and AU, you might have contemplated going the “SIM-free” route—ditching your locked cellphone for an unlocked handset paired with a cheap MVNO SIM from one of the plethora of vendors that have seemingly popped up overnight.

The focus of this post is on longer-term SIM use in Japan. For a comprehensive guide to the whole mobile data scene, with an emphasis on Japan SIM cards for short-term stays, see our sister article on Your Prepaid SIM Card Options in Japan.

Introduction to Japan MVNOs

MVNO stands for “Mobile Virtual Network Operator”, which means an operator that piggybacks on the network of one of the major players. For most MVNOs in Japan, this means using mega provider NTT DoCoMo’s high-speed LTE network. In general, the offerings from MVNOs in Japan are so much cheaper than the cabal of three (sorry, but Y! Mobile is just SoftBank in disguise, with even worse service), that for saving money you should just change right now. This minute.

The problem is that there are so many different Japanese cellphone plans that it can be hard to choose. Mobal, Sakura Mobile, BIC SIM, Biglobe, DMM Mobile, IIJMIO, Mineo, Nifmo, Rakuten Mobile, Nuro Mobile and U-mobile are just some that we know of—there are possibly quite a few more. Our basic advice when looking for an MVNO in Japan is to consider three things: the amount of data, contract cancellation fees and whether English-language support is offered. Anything that answers lots, none/low and yes to those is worth considering.

Note that mobile contract cancellation penalties are being reduced from autumn, 2019, following a government ruling to this effect.

The two basic Japan SIM card types

Japan SIM plans are divided into two different categories—data only, or data + voice. Just because you get data only, it doesn’t mean you can’t text using SMS—most providers have an option for this (it just costs a bit extra). Without the voice option, you won’t be able to make or receive regular phone calls, but Skype, WhatsApp and other apps that allow calls over the internet will work.

To save you the time of trawling through all the Japanese mobile carrier sites and all the fine print, we have prepared comparison charts for some of the most popular data-only SIMs and data + voice options. We even added sales tax, since almost every company conveniently leaves it out because well, it’s just so difficult to add 10% to everything right? Poor sneaky things.

Data + voice SIMs

Data + voice SIMs differ to data-only SIMs in that they typically have a minimum contract period and cancellation fees. Just like the data SIMs, they have a starting fee of approximately ¥3,300 (Sakura Mobile’s set-up is a little different, though). They all charge somewhere in the region of 29-47 yen/minute for voice calls and 3-30 yen for sending domestic SMS texts. Receiving texts (both domestic and international) is free. Billing is monthly.

All prices in the table include 10% consumption tax.

Provider Data + Voice Plans
(Tax incl.)
Min. Contract Cancellation Free Contract Suspension English
Support
Link
Mobal 7GB: ¥4,500 No contract ¥0 Pricing info
3GB: ¥3,278
5GB: ¥4,378
7GB: ¥5,478
20GB: ¥7,348
No contract ¥0 Pricing info
GTN Mobile EXPRESS Data +VoIP*Premium Plan 3GB: ¥2,508
5GB: ¥2,838
7GB: ¥3,278
10GB: ¥3,828
14GB: ¥4,598
21GB: ¥6,028
No contract ¥0 × Pricing info
2GB: ¥1,540
7GB: ¥2,420
13GB: ¥3,740
12 mths Remaining mths x ¥1,100 × × Pricing info
Biglobe 3GB: ¥1,760
6GB: ¥2,365
12GB: ¥3,740
12 mths ¥1,100 × × Pricing info
IIJmio 3GB: ¥1,760
6GB: ¥2,442
12GB: ¥3,586
12 mths Remaining mths x ¥1,100 × × Pricing info
Nifmo 3GB: ¥1,760
7GB: ¥2,530
13GB: ¥3,850
None ¥0 × × Pricing info
U-mobile 3GB: ¥1,738
5GB: ¥2,178
25GB (U-Mobile Max): ¥3,168
6 mths ¥6,600 × × Pricing info
Rakuten Mobile 3.1GB: ¥1,760
5GB: ¥2,365
10GB: ¥3,256
None ¥0 × × Pricing info

Notes on above:

Mobal – When your monthly cap is reached, data is still available at throttled speeds. ¥1,000/month voice + text plan also available. Domestic SMSes at ¥12 each. Free calls to ALL Mobal phones. No resident card or visa requirements. Bulk of profits go to charity. If you’re traveling from China, you have access to a range of other packages.
Sakura Mobile – Includes 30 to 60 minutes of free local/international calls (depending on the plan). Although there are no cancellation fees, there is an all-in-one ¥15,000 “activation” fee, often discounted to ¥5,500. Flexible payment options. Student discounts.
GTN Mobile: Recently revised their plans to offer cheaper and more convenient ones. Fast network among MVNOs. Domestic calls under 10 minutes are all free. Campaign offers discounted rates for the first three months. Flexible payment options, including convenience store payment.
Nuro Mobile – Formerly So-net (run by Sony). Softbank and DoCoMo options differ in price.
Biglobe SIM – Also offer 20 and 30GB plans.
IIJmio – Often run promotions.
U-mobile – Unlimited LTE plans are also available. SIM must be returned upon cancellation.
Rakuten Mobile – 20 and 30GB data plans, as well as unlimited use plans, are also available.

With some of these plans, it may be possible to reduce call rates by using data-based apps. Although not explicitly stated above, many also allow data sharing with partners and family members. Note that other plans may be available in addition to those listed above. Data services may continue, though throttled, once the monthly limit has been reached.

Japan SIM mobal
Photo by Carey Finn

Data-only SIMs

As above, there are certain things that all plans share. For example, they all have a “starting fee” (they have different names for this) of roughly ¥3,300. But unlike data + voice SIMs, data-only SIMs often have no set contract period or cancellation fees. Also note that for the additional feature of SMS, you will generally pay a monthly fee (upwards of 130 yen a month), plus 3-30 yen per domestic message sent. Receiving SMS messages is free.

All prices listed include 10% consumption tax.

Provider Data Plans (Tax incl.) English
Support
Monthly SMS Fee Link
3GB: ¥2,178
5GB: ¥3,278
7GB: ¥4,378
20GB: ¥6,248
¥0 Pricing info
GTN Mobile EXPRESS Data +VoIP 3GB: ¥1,078
5GB: ¥1,628
7GB: ¥2,178
10GB: ¥2,728
¥165 Pricing info
2GB: ¥770
7GB: ¥1,650
13GB: ¥2,970
× ¥165 Pricing info
Biglobe 3GB: ¥990
6GB: ¥1,595
12GB: ¥2,970
× ¥132 Pricing info
IIJmioIIJmio 3GB: ¥990
6GB: ¥1,672
10GB: ¥2,816
× ¥154 Pricing info
Mineo 3GB: ¥990
6GB: ¥1,738
×  ¥0 Pricing info
Nifmo 3GB: ¥990
7GB: ¥1,760
13GB: ¥3,080
× ¥165 Pricing info
U-mobile 5GB: ¥1,628
25GB: ¥2,618
× ¥165 Pricing info
Rakuten Mobile
3.1GB: ¥990
5GB: ¥1,595
10GB: ¥2,486
× ¥132 Pricing info

Notes on above:

Sakura Mobile – Activation fee of ¥5,500. Unused data accrued to following month. Flexible payment options available.
GTN Mobile – Same quality as big carriers like DoCoMo/au/SoftBank. Flexible payment. Prompt shipment.
U-mobile – Unlimited LTE data plans are also available.
Rakuten Mobile – Unused data can be added to the following month. 20 and 30GB data plans are also available. Adding the SMS option allows IP calls using an 050 number.

With some of these mobile network providers, it may be possible to split one data plan among multiple SIM cards—this is great for families/couples. Ask when applying. Note that other plans may be available in addition to those listed above.

Unlimited data SIM cards in Japan

We don’t know of any unlimited data SIMs in Japan that allow you to do endless stuff on the interwebs at the same fast speeds forever. Packages that are described as offering unlimited data generally have a fair usage cap after which speeds get slowed down—meaning you can still do stuff on the internet, but maybe only at a (pre-climate change) glacial pace. Anecdotal evidence suggests there was once a time of unlimited (or almost unlimited) data on some of the Japanese mobile carriers—but those heady days seem to be over.

Payment options

One of the most frequently-asked questions is how to pay for a voice + data or data-only SIM contract in Japan. All of the providers accept Japanese credit cards, but unfortunately, some do not accept international credit cards. Mobal, GTN Mobile and Sakura Mobile are okay with international cards, and also allow payment by cash at convenience stores. For all the others, ask at sign-up.

Japan SIM cards: In summary

As you can see from the above, there is lots of fine print with each of these Japanese SIM card plans. Things to look out for are daily maximum usage limits, connectivity speeds, payment methods (as noted, all accept Japanese credit card, some also accept direct debit from Japanese bank accounts) and age restrictions (some are restricted to 20 or over, while others are fine as long as you have a credit card).

More options for mobile internet connections in Tokyo

Watch our short YouTube video on getting hooked up with wifi in Japan and investigate some of the best wifi router rental options.

While we do our best to ensure that the information here is correct, it is subject to change. This article was originally published on December 2, 2015. Last update: October 4, 2019.

Written by:
Filed under: Business, Internet
Tags: Au, Cell Phone, Data, Docomo, Internet, Living In Japan, Living In Tokyo, Mobile Phones, Mvno, Resident, Sim Cards, Sims, Softbank, Technology, Wifi
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