So I got my 6+ in the mail on Friday (best smartphone I've ever had btw) and I'm ready to sell my 4S. It's a 16GB Verizon model in black in excellent condition - everything works fine. I'm seeing them sell for around $100 or so on eBay. And GameStop is offering me $99 for mine. Do you think it's worth $200 or should I just sell it for $100 cash to Gamestop? Also I have another 4S I'm selling but the whole back of it is cracked from a drop but it functions fine. GameStop said they'll take it for $40 cash. That seems too low for a functioning 4S or should I do it? ---------- Or would it be better to sell it to Verizon for $200? But if I do that, I'm pretty sure they'll only give me credit back and not cash?