Sticking with AT&T
I would like to switch carriers because AT&T's coverage is definitely lacking compared to Verizon where I live (Southeast TN), however I won't be switching even though my contract is up at the beginning of October.
Why I'd like to switch:
AT&T throttles my data after 3GB each month (grandfathered unlimited data)
Coverage is much worse than Verizon, though AT&T has gotten better.
The whole Facetime over 3G fiasco...
While there is no LTE where I live, I think Verizon is most likely to have it first.
Why I won't switch:
The shared data plans are much more expensive (regardless of carrier) than what I pay now. We don't need unlimited minutes or texting. We currently pay $122 for two iPhones on an older family plan. I can't get anywhere close to that cheap with the new plans. I can get close on Sprint, but don't want the slow data.
AT&T may throttle my data after 3GB, but at least it is still technically unlimited.
Verizon is quite a bit slower than AT&T where I live.