UPDATE: Still waiting to hear from T-Mobile on the official payments that you’ll make at the end of these 18-month JOD! agreements if you want to keep your phone, but here’s what my back of a napkin math estimates are: $164, $182, and $200 for the 16GB, 64GB, and 128GB iPhone 6s models, and $192, $210, and $228 for the 16GB, 64GB, and 128GB iPhone 6s Plus.

Following John Legere’s pre-announcement last night, T-Mobile today officially announced its $5 iPhone 6s trade-in promo.

Just as expected, if you trade in an iPhone 6, 6 Plus, or a recent Samsung device like the Galaxy S6 or Note 5, you can get a 16GB iPhone 6s with JUMP! On Demand for $0 down and $5 per month. A flagship from 2014, like the iPhone 5s for Note 4, will get you a 16GB iPhone 6s for $10 per month. Meanwhile, “almost any other phone” will get you a $15 per month payment on the 16GB iPhone 6s.

If you’d like to keep your 16GB iPhone 6s after your 18 monthly payments, you can fork over $164. (I’m waiting to get pricing details for the other models from T-Mobile.) That’s a nice deal, and while you might be able to get a bit more cash for a newer phone like the iPhone 6 if you sell it on eBay or Craigslist, lots of folks would probably rather go the simpler route of just visiting their friendly neighborhood T-Mobile store and handing their device to a rep.

It’s also worth noting that if you end up canceling your service while still making payments, your promo pricing will come to an end and you’ll have to pay up to $27 per month. At that point, you’ll have to either turn in the working device or pay it off to keep it.

Here’s how T-Mobile’s JUMP! On Demand pricing breaks down for the other iPhone 6s and iPhone 6s Plus models:

As John Legere announced yesterday, T-Mo’s not leaving folks that already pre-ordered an iPhone 6s or 6s Plus out in the cold, because they’re giving them an “upfront bill credit.” Good on ya, T-Mobile, for making sure that anyone that’s already committed to getting a new iPhone on your network can get this same trade-in pricing as folks that waited for whatever reason.

T-Mobile also confirmed today that it’ll start stocking the Apple Watch on September 25, so you can get some new duds for your wrist to go along with your new iPhone. The Apple Watch and Apple Watch Sport will be available online, while stores will have the Apple Watch Sport available. Those stores will carry the following models:

• Apple Watch Sport – Silver Aluminum White Band (38mm & 42mm)
• Apple Watch Sport – Space Grey Black Band (38mm & 42mm)
• Apple Watch Sport – Rose Gold Lavender Sport Band (38mm)
• Apple Watch Sport – Rose Gold Stone Sport Band (42mm)
• Apple Watch Sport – Gold Aluminum Antique White Sport Band (38mm)
• Apple Watch Sport – Gold Aluminum Midnight Blue Sport Band (42mm)

As far as pricing goes, T-Mo will have some “special limited time” pricing on the Apple Watch Sport. The 38mm models will cost $0 down, 23 payments of $14.54 per month, and 1 payment of $14.58, while the larger 42mm watches will cost $0 down, 23 payments of $16.62 per month, and 1 payment of $16.74 per month. The stainless steel Apple Watch will be available at full retail price, which is $549 for the 38mm version and $599 for the 42mm model.

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