Because I was paying 109.00 for three lines with 700 minutes talk and text with VZW, and with Sprint's ERRP ( new SERO) I paid 109.00 for 1600 minutes WITH data for all three phones. Sprint's VOICE is pretty solid here. DATA, OTOH, is something else entirely.
In April,2010, when contemplating this decision, ( After all I had been with Verizon since 1999....) ,all information available pointed to Sprint NOT charging extra for 4g, according to Dan Hesse, at CES or one of those electronics shows...AND Sprint offered one year upgrades at my level of spending. SO I paid my ETF with Verizon, and ported over to Sprint. I sign up, not two months later comes the EVO, first thing they do is slap 10.00 on the top for "premium data". WTF IS "premium data"? Nope not 4g, because I am not within 300 miles of the nearest 4g. And to call what we receive "premium" is like calling spam steak. I think, in the month I have had a phone capable of speedtests, I have had one speedtest that was faster than fast dialup. NOT what I was expecting, not at all. I thought it was my Blackberry at first, so I let it slide. I didn't know how bad it was, like I said, until I got my Evo. So not only am I now paying 10.00 extra for that Evo, now, if I do something as simple as an ESN swap to a phone I already OWN, I am going to get charged 10.00 more on my OTHER lines? I don't think so. I'll fight first. I'll lose more than likely, but I'll fight.
Digiblur tried to tell me about Sprint's craptacular data service in Louisiana....sometimes I don't listen that well. Cost is NOT the be-all and end-all, understand, its about value and what I am receiving for what I pay is only better on paper.