Yes: Cricket, which with no-contract, prepaid service for the iPhone 4 and 4S, will be . The catch is, you'll have to wait, though not terribly long. Cricket will begin offering its no-contract plan for the iPhone 5 on September 28. That's a week after AT&T, et al start selling the phone. Note that since Cricket can't count on two years of service fees from you, it makes you pay up for an unsubsidized iPhone. The company hasn't announced pricing yet, but in the case of the iPhone 4S, that was $500 for a 16GB model.

It's up to your carrier. Sprint and Verizon , which lets you video chat even when you don't have a Wi-Fi connection. AT&T requires that you purchase a Mobile Share plan to use the feature.