So I sold my 5S when I purchased my 6+. This phone was on AT&Ts Next Plan and I originally didn't know if I'd turn it in or sell it on my own. Long story short, I did not ask AT&T to unlock it when I decided to sell it and the eBay listing did not indicate the phone was unlocked. It was listed as being on AT&T. HUGE shame on me for not taking a few minutes to submit an unlock request and list it as unlocked. Anyway, fast forward a few weeks later and now the buyer is asking I unlock the phone. I went on eBay and saw how dumb I was and see that devices listed as unlocked sell for $75-$100 more. So should I ask (or even can I ask) the buyer to compensate me for unlocking the phone? Also, the buyer has not given any feedback to me for this transaction (or any eBay purchases he's made in the past). Should I ask that he provide positive feedback as well? I don't know if he'd complain to eBay about me asking for more money or not. I like to consider myself a nice guy but don't want to give that away for free, especially to this buyer. Any advice would be appreciated.