Verizon Edge allows customers to pay full retail price for their phone over 20 months. You can upgrade to a new phone as soon as 30 days has gone by as long as 60% of the phone is paid off. T-Mobile Jump! charges $10 per month to enroll in the plan, and requires that you pay off your phone in 24 monthly installments. Once you've paid down 50% of the price, you can upgrade to a new phone. With AT&T, you have 20 months to pay off a device, and you can upgrade once every 12 months. Considering that 80% of Apple iPhone units are purchased at third party locations, and only 20% are purchased directly from Apple, opening up Apple Store sales to the carrier's early upgrade programs could be quite positive for Apple.
Apple Store workers and Genius Bar employees will start to receive training on the plans from Sunday, August 10 to Thursday, August 28. The 4.7 inch Apple iPhone 6 is expected to be unveiled on September 19th with the larger 5.5 inch model believed to be scheduled for an October introduction.
source: 9to5Mac via MacRumors