Yay - 21Mb/s!
As long as:
..you are standing at the base of the mast.
..at three in the morning so you're not sharing the cell with anyone else.
..the operator has upgraded the backhaul, core and transits to cope with those kinds of speeds.
It's progress of a sort but I doubt many people will see 21Mb/s very often if at all. I can believe 'a bit faster than at the moment' though.