A:Answer I am considering upgrading from the S-8+ to the S-9+ too. I am going to pay off my S-8+ and sell it myself. I can get more than $350 because I am adding an Otterbox case, OEM fast charger, invisashield screen protector, and the $90 AKG earphones that came with the S- 8+. You will get the AKG'S with the new S-9+ I bought my S-8+ last July for $516 on sale. I owe less than the $350 trade-in credit. I haven't really researched how much more I will get by selling it on my own.