PC World – T-Mobileâs fastest phone to dateâthe Samsung Galaxy S– will go on sale sometime in February, the company said Wednesday. T-Mobile says the phone will be the first in its portfolio to handle (theoretical) download speeds of up to 21 megabits per second (mbps). T-Mobileâs other marquee smartphonesâthe HTC myTouch 4G and the HTC G2âmax out at 14.4 mbps.