The "free iPhone 18 Pro" turning up in early Prime Day coverage isn't an Amazon price cut, and it isn't a Prime membership perk. It's a T-Mobile promotion. T-Mobile's current offer page calls the phone "On Us" through up to $1,200 in bill credits spread over as many as 36 months, on a line with service that costs at least $100 a month with AutoPay, plus taxes and fees.
Here's what that means for anyone who clicked a shopping roundup expecting a discount at checkout. The promoted 256GB iPhone 18 Pro lists at $1,199.99, so the $1,200 maximum can cover the whole phone. If the credits are spread across the full 36 months, that is about $33.33 a month in credits. None of that money comes off the price on the day you buy. You sign a finance agreement, and under the promotion's stated terms you owe tax on the full $1,199.99 plus a $35 device connection charge at the sale. The credits show up on later bills, and T-Mobile says they may take two billing cycles to start.
Two ways to qualify, both conditional
The no-trade-in route asks for qualifying credit, a new line, an eligible number ported in from another carrier and the Experience Beyond 2.0 plan. Existing customers already on legacy Experience Beyond or Go5G Next qualify too. Tom's Guide reported the same structure on Sept. 28: the free 256GB iPhone 18 Pro depends on switching and porting a number, or trading in an eligible phone, while on an Experience Beyond plan.
The trade-in route requires the qualifying $100-or-more service plus an eligible phone. T-Mobile's current examples show how much the phone you hand over matters:
- iPhone 16: $1,200. The maximum credit, enough to cover the $1,199.99 phone.
- iPhone 14: $930. Leaves $269.99 to pay, equivalent to about $7.50 a month if spread across 36 months.
- iPhone 6: $500. Leaves $699.99, equivalent to about $19.44 a month if spread across 36 months.
Among the published examples, only the iPhone 16 gets the hardware to a net $0.
The plan is the commitment
T-Mobile doesn't list a separate service contract. Receiving the full promotional value can take up to three years: the promotional line has to stay active and in good standing, on qualifying service, with the financing open, for the credits to keep landing. Pay the phone off early and the remaining credits stop. Cancel the entire account before all the credits post, and the credits stop while the remaining financed balance comes due. T-Mobile allows no more than four discounted devices per account. It also says the offer may not combine with some other discounts, and customers who canceled lines in the previous 90 days may have to reactivate them.
If the credits run for the full 36 months, service at the $100 minimum totals $3,600 before taxes and fees. That's not an extra charge if a premium unlimited plan is what you wanted anyway. It's the condition attached to the phone, and it's the number to hold up against what you pay now.
The current page differs from the launch announcement
When T-Mobile announced the lineup on Sept. 10 (preorders Sept. 12, availability Sept. 18), the newsroom post used an iPhone 15 as its example for the maximum trade-in credit. It also said an eligible trade-in could be accepted in any condition. The live offer page now uses an iPhone 16 for the $1,200 example and doesn't repeat the any-condition language in its detailed trade-in terms. Checkout terms are the ones that count, so confirm your specific phone and its condition before you commit.
What T-Mobile hasn't said
- An expiration date. T-Mobile calls the promotion limited-time and subject to change but hasn't published an end date. Nothing ties it to a Prime Day countdown.
- Full eligibility lists. T-Mobile hasn't published a complete list of eligible port-in carriers or eligible trade-in devices.
- Whether the trade-in route requires a new line. The page imposes that requirement only on the port-in route.
- Who can finance the upfront charges. T-Mobile says EIP Flex 36 can finance the device, taxes and fees over 36 months for qualified customers, possibly with finance charges based on creditworthiness. But the offer page says tax is due at sale, and it isn't clear that every buyer can roll those charges into financing.
Our judgment, separate from the terms: if you were already headed for a $100-plus premium plan on T-Mobile, up to $1,200 in credits is real money. If you qualify for the full credit and keep the eligible line, qualifying service and financing active for the full credit period, the $1,199.99 device price is offset by credits; you still owe tax on the full price, the $35 connection charge, required service and any applicable finance charges. If you're on a cheaper plan and switching only for a "free" phone, the thing you're actually signing up for is the plan.