I honestly dont think youre going to have much luck with it. Everyone Ive known that uses Sprint just doesnt seem to have the bandwidth youd need for xbox live. You might find yourself having some serious lag or getting dropped from games. But your case could be different, obviously. Assuming youre going wired from the xbox, you might find it easier to bypass the router all together; a friend of mine tethers his 360 to his notebook to stream media wireless off another computer in the network. Works just fine.