The moment to discover that your photos were never backed up is not after a buyer has left with the phone. The moment to discover that the device is still tied to your account is not when the buyer calls from another city.
A factory reset is important, but it should be near the end of a resale checklist—not the beginning.
1. Decide what must survive the phone
List the information you would regret losing: contacts, photographs, videos, documents, recordings, notes, authenticator access, WhatsApp history and files stored inside individual apps.
“Backup enabled” is not proof that the latest items are safe. Check the last successful backup time. Open a selection of cloud files from another device. Export anything that the general Android backup does not include.
Authenticator apps and banking apps require particular care. Confirm how each account can be recovered without the old phone. Store backup codes somewhere secure and separate. Do not photograph recovery codes and leave the only copy in the gallery you are about to erase.
2. Move what belongs to the SIM and memory card
Remove the physical SIM and microSD card before handing over the device. Check whether contacts are stored only on the SIM and move them if necessary.
If the phone uses an eSIM, follow the mobile network’s instructions for transfer or deletion. A factory reset may offer an option to erase eSIMs, but behaviour varies by manufacturer and reset method. Confirm with the network and the phone’s support documentation.
Copy files from an SD card you plan to keep. If the card will be sold with the phone, erase it separately using the device or a trusted computer after backing it up. A phone reset may not securely erase every removable card.
3. Check payments, wallets and device approvals
Remove bank cards and other payment credentials from the phone’s wallet. Sign out of banking and payment apps where possible, then remove the device from their trusted-device lists using the service’s official app or website.
Review accounts that approve logins through push notifications. Move those approvals to your new device before wiping the old one. If the phone is the only route to email, password recovery and two-factor authentication, selling it too early can lock you out of several services at once.
Never give a buyer your password or one-time code to “help finish setup”.
4. Record the phone’s condition and identity
Before erasing it, record the model, storage capacity, colour, serial number and IMEI for your receipt and records. Do not publish the full IMEI in a public advert.
Photograph the phone’s actual condition, including existing cracks or faults. Agree clearly on accessories, network status, battery behaviour and any repair history you know. Honest records reduce later disputes.
Use a written receipt containing the date, agreed amount, device description and the parties’ acknowledged contact details. Avoid retaining unnecessary copies of a buyer’s sensitive identity documents.
5. Remove accounts correctly
On the phone, open Settings and review Accounts, Passwords & accounts, or the manufacturer’s equivalent. Remove Google Accounts and any manufacturer account, such as a Samsung or Xiaomi account, according to the official device instructions.
This matters because Android theft protection can require the previous Google Account credentials after an unauthorised reset. A device that remains locked to the seller’s account may be unusable to a legitimate buyer. Do not disable theft protection for a stranger before payment and handover are secure; complete the process yourself at the appropriate stage.
If the phone belongs to an employer or school, it may be managed. Ask the administrator to remove it from device management. A local reset does not necessarily remove organisational enrolment.
6. Factory-reset from Settings
Google says a factory reset erases data from the phone, uninstalls apps and their data, and may take up to an hour. It recommends knowing the Google Account credentials and screen lock, charging the device to at least 70 per cent and connecting to a network.
Use the reset option inside Settings whenever possible and follow the manufacturer’s device-specific guidance. Menu paths differ across Samsung, Tecno, Infinix, Xiaomi, Nokia, Pixel and other Android devices.
Do not confuse “Reset settings” with “Erase all data” or “Factory data reset”. Read the confirmation screen carefully. If you recently changed the Google Account password, Google advises waiting 24 hours before performing the reset.
7. Verify the reset without completing the buyer’s setup
After restart, the phone should arrive at its initial welcome screen. Check that it does not display your notifications, wallpaper or account information. Do not enter the buyer’s account or create a temporary account for them.
At handover, allow the buyer to confirm the device starts, charges and reaches legitimate setup. If activation still requests your previous account, stop and resolve the account-removal problem privately. Do not disclose the password.
Nigeria-specific handover precautions
Meet in a safe public place or established shop, not an isolated location. Confirm payment inside your own bank app rather than trusting a transfer screenshot or SMS alert. A “successful” image can be forged and a pending transfer may still fail.
Do not allow a buyer to leave with an unlocked phone “to test it” before payment is verified. If a marketplace or shop acts as intermediary, understand its inspection, payment and dispute rules.
Keep your receipt and device record, but do not retain access to the buyer’s new account. The goal is a clean transfer, not continuing surveillance.
Frequently asked questions
Does a factory reset delete my Google Account?
It removes account data from the device; it does not delete the Google Account itself. Deleting an entire Google Account is a separate and much more serious action.
Should I reset before the buyer arrives?
Complete backups, account transfer and documentation first. You can reset shortly before a secure handover, then let the buyer inspect the welcome screen and basic hardware state.
Is deleting photos manually enough?
No. Copies may remain in app folders, downloads, messages, trash, removable storage or signed-in services. Use a proper factory reset after the full preparation checklist.
Continue reading on Tech Embed
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- How to protect your Android phone in Nigeria
Topic hub: Explore more in Cybersecurity in Nigeria.
