Your best bet it simply to go to the tower, and look at the power meters. They should be labeled with the carriers name.
Hey btb601, It was rather easy to geolocate the EVDO towers in Joplin. Called Sprint PCS at 800-480-4727, worked my way thru to tech support. The guy was VERY helpful, consulted his intranet, and rattled off 10 towers with street locations, as well as whether they were outfitted for just cell service, or EVDO. Additionally, he was able to confirm from real-time transmission rates that ALL were RevA provisioned. Cool. Give it a try. ElmasnoJ
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