The Sprint early upgrade plan is said to start on Friday, Sept. 20 and cost $27 a month over the course of 24 months when a $650 smartphone is involved.
However, after 12 months Sprint "One Up" customers can turn in their devices and eschew the rest of the payments in exchange for a new smartphone or tablet.
Sprint One Up vs AT&T vs T-Mobile vs Verizon
However, a leaked Sprint chart suggests that "One Up" trumps its competitors with a total that is anywhere from $228 to $539 cheaper over the course of 12 months.
That's because Sprint's Unlimited and My Way plans are less expensive than all of its rival carriers and, unlike T-Mobile, it doesn't charge a $10 annual upgrade fee.
TechRadar asked Sprint to confirm the leak chart's numbers and to confirm the existence of "Sprint One" and will update this story when and if that happens.