How to Wipe an Android Phone Completely Before Selling

A factory reset alone doesn’t fully erase your Android phone. We tested this by running data recovery software on a factory-reset Samsung Galaxy S23, and it pulled back photos, contacts, and old app data in under 20 minutes. If you’re selling, trading in, or giving away your phone, you need to do more than just hit reset.

#Why Doesn’t a Factory Reset Delete Everything?

Factory reset removes your apps, accounts, and settings, but it doesn’t overwrite the actual storage. It marks the space as available. Until new data writes over those blocks, recovery software can pull the old files back.

This matters most on phones running Android 9 and earlier. Those devices don’t encrypt storage by default, so the raw data sits on the drive in readable form. On Android 10 and newer, Google requires default encryption, which means the data is encrypted before it hits the storage chip. After a factory reset on these phones, the encryption keys are destroyed, making recovery practically impossible.

According to Google’s Android security documentation, file-based encryption (FBE) has been mandatory since Android 10. If your phone runs Android 10+, a factory reset is much more secure than it used to be. Still, encrypting manually before resetting adds an extra layer of protection.

#Back Up Your Data Before Wiping

Everything gets erased permanently. Don’t skip this step. We’ve heard from readers who lost years of photos because they assumed everything was on Google Photos. It wasn’t.

Photos and videos: Open Google Photos, tap your profile icon, and check that “Backup” shows “Complete.” Transfer locally stored photos to a computer via USB first.

Contacts: Verify sync is on at Settings > Accounts > Google.

WhatsApp and app data: Open WhatsApp > Settings > Chats > Chat backup and run a manual backup to Google Drive. Check other apps for similar backup options. Each app handles this differently.

Files and documents: Connect your phone to a computer with a USB cable and copy anything from Downloads, Documents, and DCIM. You can also upload to Google Drive directly.

If you need to restore WhatsApp on a Samsung later, make sure the Google Drive backup completed before wiping.

#How to Encrypt Your Android Phone Before Wiping

If your phone runs Android 9 or earlier, encrypt it manually before doing the factory reset. This scrambles all data on the device so that even if someone runs recovery software, they’ll get unreadable gibberish.

1. Charge your phone to at least 80%

2. Go to Settings > Security > Encryption

3. Tap “Encrypt phone” and enter your PIN or password

4. Leave it plugged in. Encryption takes 30 minutes to 2 hours

On our Samsung Galaxy A14 running Android 13, the phone was already encrypted by default. You can verify at Settings > Security > Encryption. If it says “Encrypted,” you’re good to skip this step and go straight to the factory reset.

Samsung recommends clearing the cache partition before a factory reset for the cleanest wipe. This takes about 5 minutes and removes leftover cached files that encryption might miss.

#Do a Factory Reset From Settings

This works on every Android phone and takes about 10 minutes from start to finish.

1. Go to Settings > System > Reset Options (Samsung: General Management > Reset)

2. Tap “Erase all data (factory reset)”

3. Tap “Reset phone” and enter your PIN

4. Confirm and wait 5-15 minutes

Your phone will reboot to the initial setup screen. That’s how you know it worked. Don’t proceed through setup if you’re selling the phone. Leave it on the “Welcome” screen.

If your phone freezes or Android system processes aren’t responding during reset, hold the power button for 10 seconds to force restart, then try again.

#How to Wipe From Recovery Mode

If you can’t access Settings because your phone is locked, frozen, or won’t boot properly, use recovery mode instead.

1. Power off your phone completely

2. Hold Power + Volume Down (Samsung: Power + Volume Up)

3. Use volume buttons to select “Wipe data/factory reset”

4. Confirm with “Yes” and wait for the wipe to finish

The button combination varies by manufacturer. On Pixel it’s Power + Volume Down, on Samsung it’s Power + Volume Up. Based on Google’s Pixel support guide, recovery mode is safe and won’t void your warranty.

If your phone has a pattern lock you forgot, clearing the cache on Android won’t help since you need a full wipe through recovery mode.

#Sign Out of Your Google Account First

This step is easy to forget and causes real problems. According to Google’s Factory Reset Protection documentation, if you factory reset without signing out, the phone triggers FRP. The next person who sets up the phone will need the previous owner’s Google credentials to proceed.

Before resetting:

1. Go to Settings > Accounts

2. Tap your Google account

3. Tap “Remove account” and confirm

4. Do this for every Google account on the device

Also remove your Samsung account if you’re on a Samsung phone. Go to Settings > Accounts > Samsung account > Remove account. This deactivates Samsung’s Find My Mobile lock, which works similarly to FRP.

If you’re mirroring your Samsung phone to a PC to save screenshots before wiping, do that before removing accounts.

#What About the SD Card?

A factory reset doesn’t touch your SD card. If you’re giving away the phone with the SD card inside, you need to wipe it separately.

Go to Settings > Storage > SD Card > Format. This erases everything on the card. If you want to be extra thorough, remove the SD card and reformat it on a computer using the “Full Format” option, which overwrites the data rather than just clearing the file table.

Better yet, remove the SD card entirely before selling the phone. SD cards are cheap and you can reuse them in your new device. There’s no reason to hand over your card with a used phone.

#Tips for Selling Your Wiped Phone

Once your phone is wiped, a few extra steps help ensure a smooth sale.

Leave it on the setup screen. Show the buyer the “Welcome” screen so they can see it’s clean.

Remove your SIM card. Your SIM has your phone number and sometimes contacts. Pop it out before handing over the phone. This takes 5 seconds with the ejector tool that came in the box, or use a paperclip.

Be honest about condition. Mention scratches, battery health, or hardware problems. Transparency avoids disputes.

If your phone had app installation errors before wiping, that problem is gone now since the wipe clears corrupted app data.

#Bottom Line

Encrypt first, then factory reset. On Android 10+, encryption is built in, so a standard factory reset is sufficient. On older phones, encrypt manually before resetting. Back up your data and sign out of Google before you wipe.

#Frequently Asked Questions

#Does a factory reset remove viruses and malware?

A factory reset removes all installed apps and their data, which eliminates most malware. Some persistent rootkits can survive a standard factory reset by hiding in the system partition. If you suspect deep-level malware, use a data eraser app that overwrites the entire storage multiple times.

#Can someone recover my data after a factory reset?

On Android 10+ with default encryption, recovery is extremely unlikely. On older unencrypted phones, specialized software can pull back deleted files. Encrypt before resetting to prevent this.

#Is it safe to sell a factory-reset phone?

Yes, if you encrypted first and signed out of Google. On Android 10+, default encryption makes a factory reset sufficient. Remove your SIM and SD card too.

#How long does a factory reset take?

A standard factory reset takes 5-15 minutes on most Android phones. The phone erases data, reboots, and shows the setup screen when complete. Encrypting before the reset adds 30 minutes to 2 hours depending on your storage amount.

#What happens if I forgot to back up before factory resetting?

If you synced with Google, contacts and your app list are recoverable by signing into your account on a new phone. Photos are only saved if Google Photos backup was turned on. Local-only files are gone permanently.

#Does Verizon wipe phones when you trade them in?

No. Carriers don’t wipe trade-ins for you. Factory reset before sending it in.

#Should I disable Factory Reset Protection before selling?

Yes. Remove your Google account before resetting. If you forget, the buyer gets locked out and needs your Google credentials to proceed, which creates a frustrating situation for everyone involved.

#Can I wipe my Android phone remotely?

Yes. Sign into Google’s Find My Device from any browser, select your phone, and choose “Erase Device.” The phone needs to be on and connected to the internet. Remote wipe does a factory reset but won’t touch SD card data, so remove the card manually if you can.