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Selling a phone or computer: erasing your data properly
Before your old device changes hands, your data has to be gone for good. Deleting files is not enough – here is how to do it properly.
An old phone or a retired laptop is quick to sell or give away. But the storage often holds photos, email, passwords and banking apps. Before the device changes hands, that data has to be gone, reliably and for good.
The short version
- Make a backup of everything important first.
- Sign out of every account and turn off activation lock.
- Make sure the device is encrypted.
- Remove the SIM and memory cards.
- Factory reset – do not just delete files.
Step by step
Ready to sell in 30 minutes
- Backup: save important data to the cloud or an external drive.
- Sign out: sign out of your Apple Account/iCloud, Google and Microsoft accounts, and turn off Find My.
- Check encryption: passcode, FileVault or BitLocker active – the precondition for a safe erase.
- Remove cards: take out the SIM and any microSD card.
- Reset: run a full factory reset.
1. Why deleting files is not enough
When you move files to the trash, only the pointer to them is removed – the data itself is still physically there and can be recovered with the right software. The clean answer is a combination: encrypted storage plus a full reset. The reset discards the key, and what is left is unreadable.
2. Back up first, then sign out
Make a backup first, so nothing is missing on your new device. Then sign out of your Apple Account/iCloud, Google and Microsoft accounts and turn off activation lock (Find My on iPhone, device protection on Android). Otherwise the device stays tied to your identity and the buyer cannot use it.
3. Encryption is the foundation
Current devices with an active passcode are encrypted automatically – iPhone and Android, as well as a Mac with FileVault or a Windows PC with BitLocker. That encryption is what makes the data unrecoverable after a reset.
4. Cards out, then reset
Take out the SIM and memory cards – they will not make it to your new device if you forget them. Then reset the device fully to factory settings through its settings menu. Only after that is it ready to hand over.
Common mistakes
- Only deleting photos and apps instead of running a full reset.
- Forgetting to sign out – activation lock then blocks the buyer.
- Leaving the SIM or microSD card in the device.
- No backup – important data is gone for good after the reset.
- Throwing away broken, unencrypted drives without checking.
Frequently asked questions
Is it enough to just delete all the files before selling?
No. Simply deleted files can often be recovered. What is safe is the combination of active encryption plus a full factory reset – after that the storage is effectively unreadable.
Why do I have to sign out of my account before resetting?
Otherwise activation lock stays on: an iPhone keeps asking for your Apple Account through Find My, and Android asks for your Google account. The buyer could not use the device – and it would still be tied to your identity.
What about a broken device that will not start any more?
If the device was encrypted (which any current device with a passcode is), the data is unreadable without your code. For very sensitive data, or an old unencrypted device, physically destroying the storage is the safest answer.
Topics: Devices