Sprint has one of the best IP backbones in the world. However you have to get to it, which is the challenge for all wireless providers. Speed is one thing but if the connection from the cell tower to the wireline/fiber optic backbone is poor, then 4G/LTE/etc. does not matter. Just ask AT&T. Of course AT&T cannot find their IP backbone with a map and a flashlight, which is another problem altogether...