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The 3G15Wn gives you the flexibility to decide how you connect to the Internet. It has an ADSL2+ port for a fixed line connection and also includes a USB port that can connect to a 3G USB modem. The 3G15Wn uses ADSL as its primary connection to the Internet if both options are available; however should the ADSL connection fail for any given reason, then the 3G15Wn will automatically revert to 3G to provide an Internet connection. We call this automatic failover.