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Are you in a Sprint Network Vision /lte area?
If your not? hotspot with sprint
will be almost useless with the legacy 3G.
I had a rooted evo with wimax
And i can tell you it was a headache using the hotspot. Even if I had say 6mb download speed on my evo ? The tethered speed on the connecting device was maybe 500kb. But as they say ymmv.