How do I check for Activation Lock before purchasing a used device?

How can I disable it ?

When you buy an iPhone, iPad, iPod touch, or Apple Watch from someone other than Apple or an authorized Apple reseller, it is up to you to ensure that the device is erased and no longer linked to the previous owner’s account.
You can check the current Activation Lock status of a device when you visit from any Mac or PC.























After Checking you will be advised if this Iphone is lock or unlock.