Illustrative photo of a person using a phone, not a device-reset screen. Photo: Jakub Żerdzicki / Unsplash (Unsplash License).

That old phone in the drawer could pay for part of your next one. But before you hand it over, there’s a much more important question than the resale price: Did you actually remove your information? Photos, saved accounts, two-factor authentication and even a forgotten SIM card deserve a final look.

A factory reset matters, but it should be the last major step, not the first. The safest handoff begins by confirming your data has moved to a device you control. Then disconnect accounts and accessories, erase the old phone, and check what a new owner would see. This guide covers both iPhone and Android, with the differences that tend to catch people out.

1. Make sure your backup is usable

It’s easy to see a cloud-backup checkmark and assume everything is ready. Take a few extra minutes to look at what really transferred. Check recent photos, contacts, calendar entries, messages you need to keep, and any files stored only on the phone. Some apps require a separate export or transfer, especially authenticator apps, encrypted chats, and financial services.

If you’re switching phone numbers, update recovery and two-factor authentication settings for your most important accounts before losing access to the old number. The U.S. Federal Trade Commission specifically warns that authenticator apps may need to be reactivated and that accounts using the old number may need an update. Don’t erase the only device that can approve your next sign-in.

2. iPhone: transfer, sign out, then erase

Apple’s current instructions start with a backup and transfer. If an Apple Watch is paired, unpair it. Sign out of your Apple Account as directed for your iOS version, then open Settings → General → Transfer or Reset iPhone → Erase All Content and Settings. The exact prompts can vary by software version. If Find My is enabled, you may need your Apple Account password.

Apple says erasing the device this way turns off Find My and Activation Lock, preparing it for a new owner. If the phone uses an eSIM, follow the on-screen choice to erase the eSIM profile when you’re giving the device away. Coordinate the transfer of your mobile plan first so you don’t unexpectedly lose service. Moving to Android? Apple also advises deregistering iMessage.

One important distinction: don’t manually delete iCloud-synced photos or contacts as your cleaning method. Apple warns that deleting synced items while signed in can remove them from iCloud and other connected devices too. Use the documented sign-out and device-erase flow instead.

3. Android: remove your account and use the built-in reset

Android menus differ by manufacturer, so treat the following as a sequence rather than one universal button path. First confirm your backup and app transfers. Then remove your Google Account from the old phone and use its built-in factory data reset in Settings. Google’s Android Help explains that removing the account turns off device protection, which helps prevent a buyer from being stopped by a previous owner’s account after reset.

If you reset an Android phone using hardware buttons or recovery mode while protection is active, the device may ask for a previously synced Google Account during setup. That’s useful when a phone is stolen, but inconvenient when you’re selling it. Google recommends following the manufacturer’s instructions for your model and knowing your account credentials before any reset.

4. The tiny things worth checking before the box closes

1. Physical SIM and microSD: remove both if present. A microSD card can contain photos and documents even after the phone itself is reset.
2. Wearables and Bluetooth: unpair a watch, car system or other accessory you no longer want associated with the old device.
3. Payment and transit cards: follow the wallet provider’s transfer or removal instructions. Some transit balances require a separate move.
4. Trusted devices: review the security settings for email, banking and other sensitive accounts. Remove the old phone from trusted-device lists where appropriate.
5. Final screen: after the reset, check that the device starts at its initial setup screen rather than opening your apps or asking a buyer to unlock your personal account.

The FTC’s consumer guidance covers backing up, removing SIM and storage cards, unlinking accounts, and erasing personal information. It’s a useful second check against the manufacturer-specific steps.

What if the screen is broken or the phone won’t turn on?

Don’t assume a device is empty because it won’t boot. Check the manufacturer’s account and device-management instructions, and ask the trade-in or recycling program how it handles inaccessible devices and data destruction. If you cannot confirm an erase, don’t promise a private buyer that the phone has been wiped. Use a reputable recycling route or professional assistance instead of improvising an unsafe repair.

Official instructions to keep open while you work

• Apple Support: Before you sell or trade in an iPhone or iPad (updated June 12, 2026).
• Android Help: Device protection and account removal.
• Android Help: Factory reset.
• FTC: Remove personal information before getting rid of a phone.

A good trade-in ends with two things: your memories are safely on the new phone, and your old phone no longer knows who you are. Transfer first. Disconnect second. Erase last.

Editorial note: Guidance checked October 15, 2026. Menu names can change with device software, carrier and region. This is a practical information guide, not a record of a personally tested device. No affiliate links.