Crucially, sign out of Find My iPhone or Google Factory Reset Protection (FRP) to avoid "locking" the phone for the next user.
To protect your privacy and ensure the device is ready for a new owner, follow these standard industry steps before any transaction: buy and sell cell phones
If you are selling a specific phone on a marketplace like Facebook, eBay, or Swappa, use this structured format to attract serious buyers. Crucially, sign out of Find My iPhone or