Hey everyone. My friend sold me his iPhone 5S, I had it reset and then I activated it with my SIM. After testing it out I wasn't quite happy with it as I don't think the upgrade was really worth it from my iP5. I took out my sim and then slipped it back into my 5 and was thinking about selling the 5S on eBay. Now do I have to reset the phone completely or can I still just leave it activated so that the buyer just needs to pop in there SIM card. I don't have any info on the phone. Only used it for a day or two to test it and didn't use it with any personal information outside of having my SIM in there to activate it. Would just like some clarification, thanks!