Q: i have a second hand iphone 5s and the owner hasnt removed the icloud and i have no details for the seller so what can i do ?

Nothing. Without the previous owner releasing it from his iCloud account, it will remain in Activation Lock forever. It is totally worthless to you.

Yep. You got ripped off. There is a very real possibility it's a stolen phone. If you can't contact the seller, and you did not purchase it through a service that provides some kind of buyer protection, turn it over to the police. It's a brick.

You could still get some functionality out of the phone using a Dns server. You can take pictures, browse the web, check your email... But you are still pretty limited. There are ways to bypass the icloud lock, but there is a small chance that they will work. I would just sell it on ebay. Maybe someone could scrap it for parts or something.

No. You can't. Activation lock can not be bypassed.

_Apple_Is_The_Best_ wrote:

There are ways to bypass the icloud lock, but there is a small chance that they will work.

As in zero.