I bought an iPhone 4 the day it was released back in June 2010, which means I'm using AT&T. I've been holding out on upgrading because I'm waiting for an iPhone 5 (or "The New iPhone." Whatever Apple will call it).
I'm not on a shared plan with anyone. I send fewer than 25 texts a month since I do my texting via Google Voice. I do most of my calling via Google Voice too.
My monthly bill is around $68 a month.
What are the benefits of going with a different carrier for my next iPhone? Will AT&T make me change my plan at all if I buy a new iPhone and stick with them?