Ya, it doesn’t matter what you do with the phone. AT&T doesn’t use the phone itself as collateral for your “Next financing/loan”. Your service will be cut if you don’t make the payments after you inform them of a trade-in and never give the phone back.
I just let a friend buy my phone which I told AT&T I was going to trade in. He bought it for what I owed on it. Like $444. Just going to use that money he gave me to pay the balance due on the phone once I am billed for the non returned phone. My friend really needed a phone badly since his 6s battery was draining about 20%/hour even after a battery replacement. He put his AT&T SIM in my 7Plus after I wiped and reset it, and the phone works flawlessly.
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If you sell it and pay it off, you can get the X on next plan again.
FWIW, I sold a Buy 1 Get 1 Free iPhone 7 to my uncle and continued paying it. Granted, I sold it to family and he knew what I was doing.
He can also do a trade-in upgrade and then never return the phone. He just needs to pay off the phone when billed.
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No you can’t do that. You have to pay it off first as I said in other post. Just like you can’t sell a car until it’s paid off.
Again. False.
The car analogy is bad. There is no state title or papers to transfer with a phone and the car is usually collateral against a loan.