I'm not necessarily saying that this doesn't work, but in my case, my 3G Data speeds dropped by more than half. I was averaging 150-250kb/s (over 5 tests) and after doing this I'm getting between 40-100kb/s (over 5 tests). I'm sitting in the exact same spot and this has been the only change..
Hopefully it's just a lag in Sprint's service and it might get better later.