This is the driver which you will need for the Samsung Kiera 2 wireless software, Note that this was the last driver released for the Samsung Y3400 data modern used on your mobile phone modem. This wireless driver is needed on the Samsung NP300V4AI Series 3 Notebook.
You can also find the Samsung USB driver on this website. The ID for the data modem has been listed below and this runs on Windows 7.
Device Name: Samsung Kiera2 Wireless Modem
Hardware ID: USB\VID_04E8&PID_6906&MI_00
Device Name: Samsung Kiera2 Wireless Ethernet Adapter
Hardware ID: USBCDCECM\VID_04E8&PID_6906&MI_06
Device Name: Samsung Kiera2 Wireless Modem Enumerator for Network Device
Hardware ID: USB\VID_04E8&PID_6906&MI_06