• Plug the Huawei E3372 USB dongle into USB-1 port on Draytek Vigor (which corresponds to WAN-3)
• WAN > General Setup. Make sure WAN3 is Enabled and set to Always On.
  

• WAN > Internet Access. Next to WAN3 select “3G/4G USB Modem (DHCP Mode)“, then click on Details Page.
  For some older USB dongles you may need to select “3G/4G USB Modem (PPP Mode)”
  
• In Details Page fill following fields:
  • 3G/4G USB Modem(DHCP mode): Enable
  • Network Mode: 4G/3G/2G
  • APN: [Check with your SIM provider. I.e EE: everywhere; Three Mobile: 3internet, etc…]
  • Click OK to save changes.
    
• Online Status > Physical Connection. Check WAN 3 Status. If everything was configured correctly it should soon display connection details.
  

October 2016
Draytek Vigor 2860ac
Huawei E3372