Autorun may automatically use Internet connection mode in certain circumstances.
Autorun automatically switches to Internet connection mode if the connection fails while syncing or connecting.
You can share your phone’s internet connection with your PC using a USB Cable. After connecting with a USB Cable, set the USB connection mode to Internet connection. Then select between Ethernet and Modem.
Ethernet This mode changes the phone to USB tethering mode from the PC. Touch Settings > Wireless & Networks > Tethering > Mobile Broadband Connection.
This mode can only be used by Tethering registered user.
Modem This mode changes the phone to Modem mode from the PC.