Sprint has shared details about its iPhone 6s and 6s Plus launch plans and price points. To start, the iPhone 6s and 6s Plus will both support carrier aggregation on Sprint's 2.5GHz spectrum (Band 41). Sprint claims cell sites with two-channel 2.5GHz carrier aggregation can deliver peak speeds of 100Mbps. The new iPhones will also include WiFi Calling, a feature already available to some older iPhone models. Sprint is offering the new handsets via its iPhone Forever program. New and existing customers who turn in an old smartphone will be able to lease the 16GB iPhone 6s for $15 per month — a price that undercuts T-Mobile's lease program by $5 and Apple's lease program by $17. Existing Sprint customers who already use the iPhone Forever program (with a 16GB iPhone 6) will be able to keep their $15 monthly payment if they upgrade to the 16GB iPhone 6s by Dec. 31. Sprint is offering to pay the ETFs of customers who switch from other carriers. Last, Sprint said it will open stores at 8am on Sept. 25, the day the iPhone 6s and iPhone 6s Plus go on sale, but it will also allow customers who prefer to avoid crowds to take advantage of Direct 2 You.