au tethering is unique in that you can use the tethering type that suits your use.
Make the best choice to enjoy a comfortable tethering life.
A variety of compatible devices, including tablets, game consoles and Wi-Fi-compatible digital cameras!
Multiple devices can be connected simultaneously!!
High-speed data communication!!
If you want to connect multiple game consoles or tablets simultaneously, Wi-Fi tethering is recommended! A variety of devices are compatible!
Long battery life! (Power consumption is a tenth of that for Wi-Fi tethering 
Easy setup! (Password entry is not required)
If you want to use a tablet outside your home or office, Bluetooth® tethering is recommended because of its long battery life!
Subscription to the "Tethering Option" is not required for connecting a 4G LTE smartphone to a compatible car navigation system via Bluetooth®
For some models, to connect to a compatible car navigation system, download and start up the dedicated app, and then set up Bluetooth® as usual.
The Tethering Option is not required for car navigation connection.
<4G LTE smartphones can currently use this service with no application at a ¥0 flat rate. However, if circumstances cause details to change, KDDI will give customers advance notice on this homepage.>
See the page below for details about the dedicated app and Car Navi Fee Option Service.
Data communications can be established while your smartphone is being powered from a notebook PC!
High-speed data communication!
If you want to use data communications on a notebook PC for an extended period of time, USB tethering is recommended!
A USB driver must be installed to a notebook PC or other device.
A USB cable for connection can be purchased from the page below.