How do I clean a used smartphone before selling it?

Cleaning a used smartphone before you sell it makes a real difference to how buyers see it. It will look better in photos, feel better in the hand, and show that you looked after it. Cleaning is also about privacy and safety, because a phone holds personal data, accounts, and messages that must be removed before it changes hands. Work through the steps below in order, and do not skip the backup and reset steps at the end.

Start by switching the phone off and removing any case, screen protector, and accessories. Use a soft, lint-free cloth, slightly damp with clean water if needed, to wipe the screen, back, and frame gently. Do not use harsh cleaners, bleach, abrasive cloths, or paper towels, which can scratch the screen or damage coatings. For dust around the edges, speaker openings, and charging port, use a soft brush or a gentle puff of air, and never push a sharp object into a port. If the phone is very dirty, wipe it again with a fresh part of the cloth until no smudges remain.

Check the camera lenses and wipe them carefully, because a smudged lens can make test photos look cloudy. If a screen protector is scratched or peeling, remove it so the buyer can see the real screen underneath. Clean the case separately if you are including it, and let everything dry fully before you put the phone back together. Do not submerge the phone in water, even if it is described as water resistant, because seals weaken with age and use. While you clean, look closely for cracks, loose buttons, or damage you had not noticed, and note anything you find for your listing.

Before you reset the phone, back up anything you want to keep, such as photos, contacts, notes, and messages, to a place you trust. Check that the backup is complete before you go further, and sign out of your main accounts on the phone. Remove any payment cards, saved passwords, and connected devices linked to the phone, and turn off any tracking or locking feature tied to your account. Remove the SIM card and any memory card, and keep them somewhere safe, because they hold your number and personal files.

Now carry out a full factory reset through the phone settings, following the on-screen steps until the phone restarts to its first setup screen. After the reset, check that your photos, messages, and accounts are gone, and that the phone no longer asks for your old account to unlock it. Charge the phone partly, wipe it once more, and photograph it clean for your listing. A clean phone, free of personal data and ready for its new owner to set up, is easier to sell and safer for you to hand over.

Next step: Post a free ad on ListAds once your phone is clean, backed up, and reset, ready for its new owner.