Does Mobile Vikings support the 4G network?

Yep, Mobile Vikings supports the 4G network. 

More info
Check the coverage map to see if you have 4G near where you live. Mobile Vikings uses the network of mobile provider Orange. That is why Vikings also surf the fast 4G network. If you are at a location where 4G is offered, it will be displayed on the screen of your smartphone as '4G' or 'LTE'.