You won’t know VDSL Router until you switch to Airtel High Speed Internet (or other internet service provider). When I switched to 24 MBPS plan, I was given a VDSL Modem (at a cost of Rs. 500 + GST), they said, my old Modem wouldn’t work well, so they needed to give a better technology Modem. I loved my earlier Modem with double antenna, it worked well for 2 years and still was working well, when Airtel Engineer removed it and put a VDSL Modem. I think, in case of emergency I can switch to my old ADSL Modem, it is written on it that it can support upto 300 MBPS, but its technology isn’t that advanced so I thought to put it aside. And let the Engineer installed a VDSL Modem. I loved ADSL Modem.