As customers continue to leave Sprint, its net income plunges by 77 percent. To combat people from leaving Sprint said that it will be pushing its Boost Unlimited program, a prepaid service that gives customers unlimited calling and texting for a flat rate, into new states. Also Sprint said that they are working on something called WiMax.
I am one of those who left Sprint. I left because they charged me too much for my calling plan, and they automatically renewed my contract with any permission. So I had to pay to leave them which is bs. Well now I have Cingular/AT&T and I am happy with them because of all those roll over minutes that I have.

[Wired]