U.S.-based carriers have laied out their pricing plans for Apple's new iPhone 6 and iPhone 6 Plus smartphones. Verizon Communications will give subscribers who trade in an old iPhone a free iPhone 6 in exchange for a two-year contract. Customers who trade in an iPhone 4, 4s, 5, 5c or 5s in working condition will receive a $200 gift card to pre-order the 16GB version of the newer model, Verizon said. The offer does not apply to Apple's other new phone, the larger iPhone 6 Plus.

Apple announced that its newest phone is starting at $199 with a two-year contract.

On Monday, T-Mobile promised it would beat any other major carriers' trade-in rates and additionally give customers a $50 credit. The company said if a customer can find a better trade-in offer from a major national carrier, T-Mobile will beat that offer, give them the difference back and will top it off with another $50. This offer starts September 17 and is for a limited time.

Sprint has announced a new option for iPhone users or potential buyers on its network with a new "iPhone for Life," program, which that allows users to rent, rather than purchase, an iPhone model and upgrade it every two years by adding $20 per month to their existing or new plan.

Sprint is suggesting that renters opt for a special iPhone-only plan that features unlimited talk, text and data for $50, making the total charge $70 per month for a base model.

By comparison, financing a base model iPhone adds $30 per month to a users' bill, or customers can opt to buy the iPhone outright at full price. Sprint says that the new rental option is the cheapest overall option compared to either the EasyPay financing or a two-year contract with comparative plans, saving users up to $575 across the 24-month period.

The new program will apply towards the new iPhone 6 and iPhone 6 Plus, which debuts at retail on September 19 in the US and select countries.