The phone you trade in doesn’t have to be the phone you own.
Carriers run trade-in promotions that credit far more than an old handset is worth on the open market. The top tiers often accept devices that are years old, scratched, dented, or barely working — because the promotion exists to move you onto a plan, not to buy your phone.
Which means the device you hand over can be one you bought last week from a stranger for a fraction of the credit.
That’s the whole idea. Everything else here is the detail that decides whether it works.
What you’ll find
- How the promos are actually built. Bill credits spread over two or three years, eligibility tiers, and the conditions that quietly decide what you get.
- The arithmetic. Purchase price, tax, shipping, plan changes, and the twenty-four months you’re agreeing to — worked through with numbers you can swap for your own.
- How to verify a phone before you pay. IMEI and blacklist checks, activation lock, and the handset still sitting on someone else’s payment plan.
- Where to buy, and how. eBay, Facebook Marketplace, Swappa, OfferUp — what each is good for, and how not to get taken on any of them.
- When to skip it. Sometimes selling your own phone privately beats the credit. Sometimes the plan requirement eats the entire gain.
No promo values quoted as current fact — they change monthly and vary by carrier, plan and region. You get the structure and clearly labelled example numbers. Substitute your own and the arithmetic still holds.
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How Carrier Trade-In Promos Actually Work
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The Trade-In Math: What the Deal Is Actually Worth
A five-line formula for any carrier trade-in promo, worked twice with example numbers — once where it pays, once where it quietly loses money.
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The ten-minute check that separates a clean used handset from a blacklisted, financed, or stolen one — and what each result actually means.
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The Phones You Should Never Buy Used
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