I just bought a new iPhone 6s (yay!). So I wiped my iPhone 6 to get it ready to sell. I went to Settings, Erase all Content and Settings, entered my iCloud password to disable "Find My iPhone", and then the device erased itself. I charged the device to 100% battery, took photos for Craigslist, and turned it off. That was about a week ago. Today, I got a buyer lined up and they told me it was still showing the Activation Lock enabled at https://www.icloud.com/activationlock/ That's weird, since I properly erased the device. Some how someone else's account ended up attached to my iPhone. Has anyone every had this experience before? I had been giving people the IMEI and serial number to verify clean ESN and AppleCare+ coverage. Is there some way they could use that information to lock the device to their account?