Yesterday John Legere teased some “big T-Mobile news” that’d be released this morning, and now that announcement has been revealed.

T-Mobile today announced the Lifetime Coverage Guarantee. With this promo, T-Mo customers that get an iPhone 6s and 6s Plus with JUMP! On Demand can get a refund on their service if they become unhappy with T-Mo’s service. Specifically, they’ll get a full refund for whatever they paid for the device within 30 days of purchase. After that, they’ll be able to get their phone unlocked at no charge and a refund for the current month of service. If you do decide to unlock your phone, you’ll get to keep T-Mo’s interest-free payment plan at its regular price.

The Lifetime Coverage Guarantee is also compatible with all phones that are included with JUMP! On Demand and also have Extended Range 4G LTE (band 12 LTE).

Getting back to the new iPhone hardware, John Legere has revealed T-Mobile’s JUMP! On Demand prices for Apple’s new smartphones. The iPhone 6s will cost $0 down and $20 per month for 18 months, while the larger iPhone 6s Plus will be $0 down and $24 per month for 18 months. After those 18 months, you can turn in your phone and owe nothing or pay an $164 to keep the iPhone 6s (there’s no mention of the cost to keep the 6s Plus). T-Mo says that those are “special introductory” prices and that they “won’t last long.”

No other pricing details for the iPhone 6s or 6s Plus have been given, but you’ll be able to pre-order from T-Mobile starting Saturday, September 12.

T-Mobile’s coverage is the one aspect of the carrier that gets the most criticism, and so the Lifetime Coverage Guarantee is T-Mo’s effort to get consumers to ignore those critics and try the network for themselves. Along with its announcement of the Lifetime Coverage Guarantee, T-Mo is highlighting its Extended Range LTE in today’s announcement, which it says is now live in 170 markets and will reach more than 350 markets in the next three months.

Here’s what T-Mobile says that its coverage map will look like at the end of 2015:

Source: T-Mobile (1), (2)