To turn off Activation Lock on an iPhone, simply turn off Find My iPhone. Turning off this feature will also turn off Activation Lock.

If you are selling or giving away the device, you should also follow the instructions in the article What to do before selling or giving away your iPhone. If you have already sold or given away the device, there is still good information at this link for what you should do.

OUTCOME

The owner of the device is able to activate and set up the iPhone.