How to use activate lock on iPhone 6s Plus?

To clear an Activation Lock, you will need the password of the associated Apple ID, or the original purchase receipt and matching photo ID and a discussion with Apple Support. If this device was recently purchased and the seller is still available, contact the seller for remediation or for refund. A remote unlock using iCloud is available to the person with the Apple ID holding an Activation Lock, if they’re inclined to unlock this device.

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Activation Lock is a theft deterrent mechanism. A theft deterrent that is easy to bypass would not be much of a deterrent. No, nobody here in the Apple discussion forums can help you clear Activation Lock. Only the previous owner, or Apple, can clear this lock. For Apple to clear the lock, you will have to provide a receipt with proof of original purchase and with matching serial number, and provide matching personal identification, or similar materials.

And as purchasing devices with Activation Lock is far too common, also see the following:

The All Too Common SAD Reality of Buying a Used iPad/iPhone

Madzercred Said:

"How to use activate lock on iPhone 6s Plus?"

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Troubleshooting a Locked iPhone:

Is your iPhone is locked? If so, get this serviced.

Hold it Right There!

Being Locked Out...

Enter the passcode incorrectly too many times, and you'd likely be locked out for good. So, hold it right there, and refer to this link: If you Forgot the Passcode on your iPhone, or your iPhone is Disabled - Apple Support. It would be the one you've always entered. If you do not know it, then look for it in a location you may have stored it in.

No Success?

Contact Apple support:

If you cannot get the above link to work, then contact Apple Support.

Apple Contact Info:

• Contact Us - Choose Locations
• Proceed from there, as necessary
• Why the Wait: Phone calls are taking a bit to go through at the moment, due to lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through.