knowfone

How to sell your used phone faster

Updated October 2026.

Used-phone buyers are afraid of three things: a copy of a famous model, a phone locked to someone's account, and a battery or screen that fails after a month. A listing that answers those fears sells faster.

Prepare the phone

  1. Back up your photos and chats.
  2. Remove your Google account and the maker's account (Settings, Accounts), then factory reset.
  3. Clean the port and the camera glass. Find the box and the receipt.

Prove it is good

Run a full Knowfone check before you reset, then open Seller certificate on the report. It is a picture with the phone's name, the answer, all twelve parts and a QR code that opens the report. Watching one short ad unlocks it; if no ad is available it is free.

Write the listing