to get on alltel evdo from certain areas, I needed to choose the following settings:
roaming: AUTO unchecking Roam guard
important: eject and plug card at least once
It seems important to eject/reinsert the card to get it to connect. It also took a long time (20+ seconds) when opening connection manager after inserting the card for the first time; searching for service, connecting/disconnecting automatically until it connected to an EVDO signal on the alltel network.