At T-Mobile retail locations, with activation of a JUMP! On Demand lease plan, T-Mobile offers the Apple iPhone 6 Smartphone for T-Mobile for $0 up front then $15 per month for 18 months when you trade in any smartphone. You can also get the iPhone 6 Plus for $0 up front then $19 per month for 18 months with a trade in. Even better, you can then upgrade to a new comparable iPhone later this year with no upgrade fees while retaining the same monthly rate. That's $380 below the cost of buying the iPhone 6 outright from T-Mobile, although you won't own this phone after your lease is up. (It's also a savings of $217 over the 18 months versus a monthly installment plan for buying outright.) Deal ends August 8, and if upgrading, you must do so by December 31 to retain this monthly price.

Note: The offer is subject to credit approval, and additional fees, including activation and insurance, may apply. You may cancel your service at anytime, but remaining payments become due and you must return your device. At the end of the 18 months, you can choose to purchase the phone at full price minus any monthly payments.