Yes 4G LTE supported but which model? give me specific dongle model
Yes supported
need specific dongle model... those operator keep jumping between different dongle

anyways local dist can arrange for most dongle supported in 1 to 3 week time 

it combine the speed. ok let me explain a bit:

your maxis = 1 IP
the other 3G router = 1 IP
the 3rd = 1 IP

Total 3 IPs to your house.. when you go to server download using web browser.. it will use only 1 of the above IP.. so you get speed of only one of line, not all 3.

but if you use download manager (IDM).. your IDM create many connection.. so to same server you create several connection, so you can use all IPs.. for each "chunck" you download you are using a different WAN, so you get full combined speed of all ur lines.

same with torrent, you download from many peers.. you Vigor router use all WANs, each WAN handle some peers, so you get full combined speed of all lines.

So conclusion is: you can get full speed of your lines on this if you use any multi-session program (download manager, P2P, torrent...etc etc)
I hope its clear   

Trial period is 4 days, sorry not 1 week

For the payment, once you confirm, PM me we finish transaction in PM. For refund, you get full refund of router price, not including shipping price, you bear courier fees