Draytek Vigor2620 Series Quick Start Manual page 34

 Set the 3G/4G USB Modem(DHCP mode) setting to Enable
 Set the SIM PIN code only if there is a PIN configured on the sim, otherwise
leave this field blank
 Network Mode defaults to 4G/3G which will auto-select the network type to
connect to and will use whichever mode the base station recommends.
Setting this to a specific mode will force that connection type, for instance 4G
Only will connect using 4G specifically. If there is no 4G network available, it
will not be able to connect to the mobile network
 Set the APN Name as required by the mobile provider, please note this may
vary by plan / SIM type, check with your provider
 Set the Username and Password if required by the ISP; most 4G connections
use DHCP which does not require a username or password configured
 If a Username and Password are required, set the Authentication to PAP or
CHAP
 The WAN Connection Detection's default mode of ARP Detect will check
connection to the gateway
 Tick Enable PING to keep alive to ensure the connection stays active, please
be aware this will use mobile data to send pings to the specified IP address
Click OK to save and apply those settings.
Go to the [Dashboard] to check the connection status in the LTE Status section:
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