All models of the new Vigor 2926 family continues to support LTE connections with the use of an USB dongle. Currently the carriers supported are AT&T and Verizon.
USB dongle to use is the AT&T Beam (AirCard 340U)
USB dongle to use Pantech 4G LTE UML290
For Verizon configure APN Name vzwinternet unless you are instructed differently from your carrier.
In most cases the only configuration needed is enabling the WAN USB as shown below
It is important to know that Draytek has also launched the Vigor 2926L model that comes with built in LTE modem in which a not so reliable USB dongle modem is not required, all you need to do is insert the SIM card.