Didn't like T-Mobile. Really slow. Like dial-up.
Thinking AT&T. They even have a stand-alone store in Hood River.
http://www.att.com/shop/wireless/plans/prepaidplans.html
How about Roam? What networks do they piggyback in Hood River? According to their coverage map, Hood River connection is weak.
http://www.roammobility.com/
Verizon looks coverage map looks ok too. However, no stand-alone store in Hood River.