Well I gathered up some courage with QPST. Now that I'm comfortable with it, I took the opportunity to try each one. Using the app from speedtest.net to measure results.
What I found for 3018 and 3019 was no data at all. 3022 was decent for speed results, but my call quality suffered. That stumps me, as I thought the voice and data networks were separate? Is that right?
3024, 3025 were about as fast as old school dial up on a 56k modem, but 3026, 27, and 28 all averaged 800 kpbs download. (I'm set to Simple IP and have 3g in my area.)
The data network was down in my area the other day, presumably, for service. Since then, 3028 has been stable for me. Signal quality hasn't improved in strength but holds. So I guess for my situation, the answer to my original question seems to be no. Thanks for your input.