Smartphone switching Q&A

Here are some frequently asked questions about switching smartphones.

What will change when you switch smartphones?

What will change from the smartphone of the carrier so far when you switch smartphones?

You will not be able to use the email addresses of carriers such as docomo and softbank that you have been using. However, recently, it seems that more and more people are switching to smartphones other than carriers, as they often communicate with Gmail and LINE.
In addition, you will not be able to use the carrier's payment service.

By using the MNP service, you can continue to use the same mobile number.

What is MNP?

MNP is an abbreviation for Mobile Number Portability, which means changing mobile phone companies without changing your mobile number.
Even if you switch from another company to J:COM MOBILE, you can continue to use your current phone number by using MNP.

How will call charges change?

A call charge of 20 yen (excluding tax) for 30 seconds is normally charged.
However, if you use a calling app, you can reduce the call charge to half price or free.

J:COM MOBILE also provides free support for app settings. Even if you want to teach your parents who live far away how to use it, J:COM will explain how to use it from the initial setup on your behalf.

Why is it advantageous to use an MVNO smartphone?

What is MVNO?

MVNO is a business operator that rents the free communication infrastructure of mobile phone lines from major mobile carriers and provides mobile services at reasonable rates.

For example, J:COM MOBILE rents communication infrastructure from au and operates mobile communication services. Your smartphone receives radio waves from an au base station, and the part that connects the base station to the Internet is J:COM line.

Why are smartphone prices so low?

MVNOs can operate with agility because they rent networks from major mobile carriers as much as they need according to the number of users.
In other words, there are no costs incurred by carriers, such as communication facilities, terminals, development of various services, and operation of mobile shops nationwide. This allows us to offer our services to our customers at a lower cost.

Are there any problems with the quality of communication or the area that can be connected?

Each MVNO operator rents a network from each carrier, so they will use the lines of the borrowed carrier.
J:COM MOBILE uses the au network, so the ease of connection and coverage areas are the same as au.

How is J:COM MOBILE different from other MVNO smartphones?

Do I have to prepare my own device or set up a SIM with J:COM MOBILE?

For general MVNO smartphones, you need to prepare a "SIM-free terminal" where you can freely insert SIM Card and set up the SIM. A SIM is an IC card required for mobile communication that records information to identify a phone number.
Mobile devices such as smartphones sold by carriers are often SIM-locked and may need to be unlocked on the carrier's official website or shop.

J:COM MOBILE provides devices with SIMs pre-installed, so there is no need for troublesome device settings or SIM settings. You can easily receive the service by simply selecting one of these devices.

Click here for J:COM MOBILE terminals

What are the useful services of J:COM MOBILE?

With J:COM MOBILE, you don't need to prepare your own device or set up a SIM, and we have ample support, so don't worry if you have any questions about settings! It's easy to get started, so feel free to try it out.

Also, if you watch videos on your smartphone, aren't you concerned about the data usage? If you use the "J:COM STREAM" app, you can watch unlimited videos! You can enjoy plenty of your favorite content, such as sports broadcasts, anime, and dramas, while keeping your monthly usage fee low.

Other frequently asked questions

Can I continue to use the email address I'm currently using on my J:COM MOBILE smartphone?

If you are using a free email service such as Gmail, you can continue to use it by logging in or setting up a new device.

Please note that if you are using an email address (domain) issued by some telecommunications companies, you will not be able to use it.

  • There are some services that allow you to continue using carrier mail even after canceling your carrier. Please refer here for details.

J:COM MOBILE does not issue email addresses, so we recommend that you switch to a free email such as G-mail in advance.

Can I continue to use LINE on my new device?

By completing the appropriate settings and procedures, you can continue to use the service on your new device.

Regarding account migration (handover) procedures, security is regularly strengthened, so please check the latest information on LINE's official blog before proceeding.
(*Please note that settings may be required before changing the model)

How to transfer your LINE account (as of July 2017)

[About the amount including tax]

  • Consumption tax differences may occur due to changes in the consumption tax rounding method under the invoice system.