Trade It In, or Sell It Yourself?
The question gets asked as though it has one answer. It has two, and which one applies depends on a distinction carriers deliberately blur by using the word “trade-in” for both.
The two things called trade-in
Standard trade-in is a valuation. The carrier assesses your specific device — model, age, condition — and offers roughly what it’s worth to them, minus a margin for handling and resale risk. This is a real appraisal of a real object.
Promotional trade-in is a fixed credit paid to anyone who brings an eligible device, largely regardless of what that device is worth. It’s not buying your phone; it’s buying you onto a plan for two or three years. The full structure is here.
The answer to “should I sell it myself?” is almost always yes against the first and usually no against the second. Everything below follows from that.
Against standard trade-in: sell it
A private sale essentially always beats a standard trade-in offer for a device in good condition, because you’re removing an intermediary who has to make money and absorb risk on the resale.
You’ll do better still if your phone is:
- Recent and in good condition. The private market pays a premium for a clean, current handset that carrier valuation grids flatten out.
- Unlocked, which widens your buyer pool considerably.
- Complete — box, charger, no damage.
The gap narrows when the device is old, cracked, or an unpopular model. At the bottom of the range a private sale can be genuinely not worth the effort: listing it, answering messages, meeting a stranger, and handling a possible dispute, all for a difference of a few dollars. There’s a floor below which convenience wins, and it’s fine to take the smaller number.
But at the top of the range — a good phone, a generation or two old — the difference is usually substantial enough to justify an afternoon.
Against promotional trade-in: usually don’t sell
Here the arithmetic inverts, and it inverts hard.
If a promo credits a fixed amount for any eligible device, the credit is typically well above what an old handset fetches privately. Selling it yourself and forgoing the promo means trading a large number for a small one.
The nuance is that these aren’t actually alternatives. You can have both, and this is the whole point of the site:
Buy a cheap eligible handset, trade that in, and sell your own phone separately.
You collect the promo credit and the private-sale price. The cost is whatever you paid for the sourced device, which is the smallest number in the equation.
Concretely, three options for someone holding a good phone facing a promo, using hypothetical figures — substitute your own:
| Option | Promo credit | Private sale | Sourced device | Net |
|---|---|---|---|---|
| Sell it, skip the promo | $0 | +$300 | $0 | +$300 |
| Trade in your own phone | +$800 | $0 | $0 | +$800 |
| Sell yours, trade a sourced one | +$800 | +$300 | −$75 | +$1,025 |
The third line is the strategy. It’s better than the second by roughly the private-sale value of your own phone, minus the sourcing cost — and that difference is exactly what people leave on the table when they hand over a perfectly good handset because the carrier asked for a phone and that’s the phone they had.
Note what the table leaves out: the plan increase, the credit period, and everything else in the trade-in math. Those terms apply identically to rows two and three, so they don’t change which is better — but they very much decide whether either beats row one.
When the promo still loses
Row three is not automatically correct. It loses when:
The plan requirement costs more than the credit. A required plan $20/month more expensive across 36 months is $720. Against an $800 credit, most of the deal is gone before you’ve bought anything. This kills more offers than anything else and takes ten seconds to check.
You won’t complete the credit period. Bill credits stop when you leave. A 36-month promo abandoned at month ten delivered under a third of its headline. If you switch carriers regularly, model the months you’ll actually stay, not the months on the contract.
You didn’t want the new phone. If the promo talks you into financing a handset you weren’t going to buy, the credit is a discount on an unplanned purchase, not a gain. Selling your old phone and keeping the money is better than a discount on something you didn’t want.
You can’t source an eligible device cheaply enough, or the eligible list is narrow enough that everything on it is expensive. Then row three collapses toward row two, and row two has to stand on its own.
The hybrid, in order
For anyone who does want the upgrade and will stay:
- Check the promo terms before anything else — eligible list, condition floor, plan requirement, credit period. If the monthly delta times the months exceeds the credit, stop here.
- Source an eligible handset, cheapest model that clears the condition floor. eBay for buyer protection, Marketplace for price.
- Verify it properly — IMEI, blacklist, activation lock, outstanding finance. Non-negotiable.
- Trade the sourced device in and confirm the credits actually start before doing anything with your old phone.
- Then sell your own phone, unlocked and reset, with the box.
Step 4 before step 5 is deliberate. If the sourced device is downgraded or rejected on inspection, your old phone is still in your hand and still eligible — you can trade that instead and you’ve lost only the sourcing cost. Sell it first and you’ve removed your fallback.
Selling your own phone well
Briefly, since it’s the other half of the strategy:
- Reset it and sign out completely. An activation-locked phone is worth nothing to a buyer, and you’re on the other side of the check now.
- Unlock it from your carrier if you qualify. Wider pool, better price.
- Photograph the actual device, powered on, including the About screen. It’s what you’d want as a buyer.
- Be accurate about damage. Undisclosed scratches produce disputes worth more than the honesty cost.
- Wipe it properly and remove the SIM.
Everything you learned checking someone else’s phone applies in reverse. The listings that look trustworthy to you are the ones you should write.
The short version
Standard trade-in: sell it yourself, unless the device is old enough that the difference isn’t worth the afternoon.
Promotional trade-in: don’t sell your phone instead of the promo — but don’t feed your good phone to the promo either. Source something cheap and eligible, trade that, sell yours separately.
And before any of it, check whether the promo survives its own plan requirement. A meaningful share of loud offers come out negative once that’s in the sum, and in that case the best move is the simplest one: sell your old phone, keep the money, and skip the promo entirely.