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How to remove your Samsung and Google accounts (FRP lock) from a Galaxy phone before selling it

If you sell a Galaxy phone with your Samsung or Google account still on it, the buyer can get stuck at an account lock after a reset. Remove both accounts first, then factory reset from Settings, and the phone is ready for its new owner.

Back up your data, then go to Settings > Accounts and backup > Manage accounts and remove your Samsung account and every Google account. After that, do a factory data reset from Settings > General management > Reset. Removing the accounts first switches off Google Factory Reset Protection, so the buyer can set the phone up with their own details.