I know T-Mobile and Sprint have honest-to-god leasing options, but AT&T, Verizon's and Apple's programs are not leasing programs, and there is no introductory pricing with them.Its still too early, it is most likely that this is just introductory pricing and the next iphone will be significantly more expensive per month, trapping people into their current phones. Remember a new phone = new lease = different price per month, wait to see what happens when it comes time to upgrade.
If you looked at Tmobile's lease prices on phones they werent having a sale on like the Galaxy it was absurdly expensive per month compared to the iPhone, I have a feeling that will happen with the Apple leasing program sooner rather than later.
The monthly payment is the FULL PRICE of the phone divided into monthly payments (24 months with Apple and Verizon, AT&T gives you various options), with the option to get a new iPhone before you've paid off what you owe on the old one (by trading it in). Totally an option. You keep making your monthly payments and you keep the phone, and you don't pay a penny more than the original full price. It's 0% APR financing.