After using iPhones on AT&T for over 4 years, I switched over to Verizon for the iPhone 4S. I’ve noticed a couple of minor differences with the default configuration of a couple of apps:
- Stocks – The default list of ticker entries includes VZ (Verizon)
- Safari – The default list of bookmarks includes My Verizon
Presumably, there aren’t different versions of iOS for different carriers, so perhaps those apps check the carrier when they’re first launched.