When I visited my ISP's website, they typed there that you could switch to VDSL to get 100Mbps download speed, but I have no idea how to switch.HIGH SPEED is very vague. Give me a number man, what do you consider high speed?
In general, ADSL best scenario ~18 mbit/sec, u wanna go higher than that, u need cable or fiber.
Translates to : WE CAN SELL YOU faster service.When I visited my ISP's website, they typed there that you could switch to VDSL to get 100Mbps download speed