I purchased an iphone online and turns out it was icloud locked?

I contacted the owner because their number was on the phone and he said its his mothers and she forgot it at a store and it was never turned in. I paid $300 for it but i still feel bad. I contacted them and asked if I can give them money for a new phone. Is it illegal to be in possession of a phone that was forgotten? I did not know upon purchase and now i feel stuck. What would you do?

Is anyone else having this problem with Kik?

So when I disconnect from my Wi-Fi to go places and when I try to send my friends a video it'll never send until I hook back up to Wi-Fi again. I have an iPhone 6 with Sprint and usually when I do try to send something I make sure I have full bars of LTE but it'll never work.