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Ya there was a thread awhile back about a rumor that sprint has canceled contracts due to constant roaming. But I believe some one chimed in and said that they roam on Verizon towers all the time with no problem. So the word is out there I guess try at your own.risk
From my understanding there are a couple ways to do this. The first is to use an app like roam control, but I believe that will only connect you at 1x speeds. The second way is to flash a verizon prl. That way you will be completely running on verizon. There is a warning with this, however, that excessive data used on roaming can raise some flags over at sprint. I have only heard of a couple cases like these (i think you would need to use a ton of data), but it is a possibility.