Depending on the manufacturer there can be different types of activation locks for Android phones. A device with an activated lock has no purchase value for us and we will not purchase it.
Please note: Resetting the device to factory settings does not automatically result in a deactivation of the activation lock!
Amongst others, there can be one of the following locks:
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Lock via Google account
Remove Google account: Settings → Accounts → Google account → Selection of Google account opens sync settings of account → Open menu → Remove account
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Lock via Samsung reactivation lock
Remove Samsung reactivation lock: Settings → Lock screen and security → Find my mobile → Deactivation of reactivation lock → Confirmation with details of Samsung account
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Lock via Blackberry ID
Remove Blackberry ID: The confirmation-email sent out when the Blackberry ID was set up, contains the link to remove the Blackberry ID