My iPhone is attached to someone else's account?

I just bought a used iPhone online and I revived it only to find out it's attached to the sellers account. Can I reset the phone and just sign into account or will that lock the iCloud?

The owner has to wipe it, then you can set it up as your own. Contact the seller, I think they can do it remotely also with find my iphone. Which by the way they can see where you are at because you can't turn that off either, so they need to wipe it as its a security feature.

Uh, oh. ICloud activation lock. Almost impossible to bypass. Either the owner 'forgot' to take it out of their profile or the phone was locked due to loss or theft. You need to contact that email address and ask them or pay them to release that device from their account. Apple won't touch it. They don't do third party drama. Worst case, send it back to the online guy and start over. Best luck.