I left Sprint on June 27th I got the 450 minutes($39.99)-250 texts($5)-unlimited data($29.99). I know tax and such is added on after,but my bill is not any bigger than with Sprint- it's actually a little less.
I was going to get the iPhone,but I got the DX2(I had the evo4g). I might go for the iPhone in the future who knows.:-\
I left because my bill was getting messed up,I was a premier member until the gold and silver(you guessed it I wasn't paying enough and I hadn't been with them since the stone age),and finally, CS was lousy,etc. I'm not bashing Sprint just stating my experiences.
You get grandfathered in before July 8th,and even if you upgrade in the near future you still get unlimited data. I asked the mgr..............So if you want to switch-hurry.........................
And yes, you only get 1 return and you keep your 2nd phone. I hope I helped or informed someone. I'm new to these forums.