Smartphone switching Q&A

Payment services provided by carriers such as Docomo and Softbank will no longer be available.
You can carry your carrier email address with you by applying to your previous mobile phone company.
How can I use the email address of the carrier I used before transferring to J:COM MOBILE? Here
In addition, you can continue to use the same mobile phone number by using the MNP service.

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.

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.

なお、J:COM MOBILEでは、アプリ設定なども無料でサポートしています。遠方にお住まいのご両親に使い方を教えたい、という場合でも、J:COMが代わりに初期設定から使い方までご説明いたします。

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.

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.

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.

一般的なMVNOのスマホでは自由にSIMカードを入れられる「SIMフリー端末」を自分で用意し、SIMの設定をする必要があります。SIMとは、電話番号を特定するための情報が記録された、モバイル通信のために必要なICカードのことです。
SIMフリー端末以外にも、キャリアで販売されているスマホなどのモバイル端末も、ご利用いただけます。ただしSIMロックがかかっている場合には、キャリアの公式サイトやショップ等で解除が必要となります。

J:COM MOBILEでは、SIMカードとセットで端末を購入することができます。また、SIMカードやeSIMのみを契約し、現在ご利用中の端末をそのままご使用いただくことも可能です。

eSIMご契約の場合はJ:COM MOBILE端末の購入ができません。

Click here for J:COM MOBILE terminals

J:COM MOBILEでは、サポートが充実していますので、設定などで疑問が出ても安心！簡単に始めることができますから、お気軽に活用してみてください。

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.