Why I left after my two year contact ended. I signed up 3 years ago and bought the original EVO 4G (WiMax) on a plan that allowed you to upgrade your phone every year. 11 months into my contract they take away the ability the yearly phone upgrade eligibility. Failure to deliver #1. A few months later it becomes more than clear they are abandoning WiMax. Failure to deliver #2. During my contract period the tower(s) in the area where I work were consistently going offline. This would kill your phone battery while it searched and searched for signal After many support calls and talking with the Sprint rep at my work we hope something would eventually be done. Promised tower upgrades were "in progress" etc etc. It never got better. Failure #3.
I switched back to AT&T (Samsung GS3) and on our family plan a year ago. Better service, faster speeds, and cheaper. I here good things about Verizon in my area and may try them some day.
So long Sprint. I wish we never met.