A
Welcome to the forums! Depending on your software, you need to remove your Google account and if you have a Samsung and a Samsung account, remove it, before resetting.Is there a syatem password so the buyer can unlock it?
And the anti-theft will be activated. If the phone has anti-theft, the accounts have to be removed FIRST before resetting or the phone will require the account to log in when setting up the phone again.A factory reset will remove all of your accounts. Whether you wish to use the phone again, or anyone else, all these accounts will need to be set up again.