[mad_jester]

EVDO and 1x are the same thing. At least they run on the same hardware at the cell tower site. The only difference is that when you have a crap load of circuits available you have EVDO speed. If you're too far away from the tower and/or there are a lot of calls being made off that particular tower, then the availability of the speed may decrease causing your phone to tell you that by displaying the 1x icon. That being said however, just because your phone displays that icon doesn't necessarily mean that your speed has in fact decreased. It just means that the last time your phone and tower "talked" to each other the speed availability was low.

I used to be a cell phone technician for US Cellular.

I would recommend what Adryn suggested, but also not to worry too much.