This guide describes settings that must be configured on 4G LTE Smartphones for use overseas and how to use these devices.
Confirming Data Charge subscription status
To use World Flat-rate Data, you must be subscribed to Data Charge. (Free)
When subscribed to Data Charge, the "start service" screen will always appear before you use data communications overseas.
Check your subscription status and apply by clicking the button below.
Turn your device's international settings on 
(1) Using data communications
Setting example) Using data communications
■4G LTE Smartphones and Tablets
"設定(Settings)" → 無線とネットワーク(Wireless & networks) "もっと見る(See more)" → "モバイルネットワーク(Mobile network)" → "ネットワークモード(Network mode)" → "自動(Automatic)" → Set "データローミング(Data Roaming)" to ON
* Depending on the model, some menu names and procedure may differ. See the user manual for more information.
* If you are still unable to use even after setting the above, turn the power off and on, and check again.
<If necessary> Airplane Mode setting
If necessary, set your device to Airplane Mode during your flight.
(2) Making calls and using SMS
Connect to the Internet
Push the "start services" button
You should now be able to use.
Restore the settings for use in Japan
If "自動(Automatic)" is selected for the network mode, you can use the device as-is.
Or, switch the network mode to "日本(Japan) (4G)" to use.
4G LTE Smartphones and tablets
"設定(Settings)" → 無線とネットワーク(Wireless & networks) "もっと見る(See more)" → "モバイルネットワーク(Mobile network)" → "ネットワークモード(Network mode)" → "日本(Japan)"