Forcing EVDO data Roam on Mogul?

[texasez]

I have alltel evdo in my home area but I cannot roam on the evdo. All I can get is sprint 1x. I have tried the settings under settings-phone-services-roaming-get settings and I cannot find a way to get alltel evdo. I can set roaming to roam only and i show evdo on the task bar but when i try to connect to the internet the phone still dials the 777 sprint internet number.
Any ideas on how to force the phone to roam on alltel evdo?
Larry