Going back to iPhone

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@wilto1987 wrote:

After 9 years of iPhone in November 2017 I upgraded to a Samsung S8.

10 months on, I just can't do it anymore and need to go back to iPhone.

I owe 22 installments of $25, so $550 on the S8.

 

Can I simply purchase an iPhone, go to ATT store, purchase and register a new sim and off we go?

Yes.  

I will want to sell the Samsung S8 so that I can apply the proceeds to the $550 that I still owe,

You would have to pay off the installments in lump sum as you can’t make partial payments.

will I or the buyer encounter any issues? Will I need to have it unlocked?

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Once paid off you can unlock it.  It would have a higher resale value unlocked as the S8 is one of the few phones than can work perfectly with any major carrier.  (ATT, T mobile, Verizon or Sprint)  In fact I moved mine to Verizon.  It reprograms the phone as soon as a new sim is installed, to work perfectly and even boots with the other carriers boot screen.  (As you know it boots with the ATT globe now).