This is what did it for me
http://http://www.reuters.com/article/2013/09/30/us-sprint-softbank-idUSBRE98T18D20130930
The SoftBank CEO public ally said that it is going to take 2 YEARS for Sprint to turn around! My contract is up, do I sign another and waste another two years being miserable with slow data and bad coverage or do I take one of the big 2 for a test run then reevaluate in two years? This is a no brainer. All you Sprint people, I've been there, defending Sprint. Promoting the hype around 800 mhz and 2.5 ghz TD-LTE, triband. Also telling your friends when you are stuck buffering a video stream, "I stick with Sprint for Unlimited data" and then they ask, what is it good for if you can't use. The 4s was my first Iphone and I know I didn't get the full experience with my lousy 3G data from Sprint. The 5s was just frustrating with the spotty lte coverage. No sense defending them anymore when a Sprint says they are going to continue to be sub par for two years.