T-Mobile just dropped a bomb of a deal for anyone that’s looking to join their network this week. The special offer announced is specific to the iPhone 6s – which is launching this Friday – and will let potential customers get their new device for as low as $5/month.

T-Mobile CEO John Legere announced the news via Twitter and shared some details as to how it will work. To get the lowest price ($5/month) for the iPhone 6s, you’ll have to trade in your current iPhone 6 at time of purchase. If you’re trading in an iPhone 5s, your monthly price will go up to just $10/month. Other devices will yield a $15/month price – not bad at all for a brand new iPhone 6s. If you’ve already pre-ordered an iPhone 6s with T-Mobile, don’t worry, you’re still eligible for this trade-in deal.

Unfortunately, some details about this deal are still very much unknown. We’re assuming this lowest base price of $5/month is for the 16GB iPhone 6s, for example, so we’re wondering how much more it’ll be for the 64GB or 128GB variants instead. T-Mobile will officially announce the deal tomorrow, according to Legere, so these details should be cleared up by then.