What a factory reset does and when you need one

A factory reset erases everything on your Samsung phone — all apps, photos, messages, contacts, and settings — and returns it to the state it was in when it left the factory. After the reset completes, you'll see the initial setup screen, as though you just unboxed the phone.

You might do this if the phone is running slowly, an app keeps crashing, you're selling or giving away the device, or you're troubleshooting a problem that won't go away. A factory reset is also the nuclear option when you've forgotten your PIN or pattern and can't get back in — though Samsung has other unlock methods that may work first.

Before you start: back up anything you want to keep. Photos, contacts, and documents stored in your Google account or Samsung Cloud will sync back after you set up the phone again, but anything stored only on the device will be gone.

Key Takeaways

  • A factory reset wipes the entire phone and returns it to factory settings, so back up your data first through Google or Samsung Cloud.
  • You can reset through Settings > General Management > Reset > Factory Data Reset, or through the recovery menu if the phone won't start normally.
  • The process takes 5 to 15 minutes and the phone will restart several times — do not turn it off during the reset.
  • After the reset, you'll need to sign in with your Google account to restore contacts, photos, and apps that were backed up.
  • If you're locked out of the phone, try Samsung Find Mobile or Google Find My Mobile before resetting, as they may unlock it without erasing data.

Reset through Settings if your phone turns on normally

Open Settings and scroll down to find General Management (the exact position varies by Samsung model and Android version, but it's usually near the bottom of the main Settings list). Tap it.

Inside General Management, look for Reset. Tap it, then select Factory Data Reset or Reset Phone — the wording depends on your model. You'll see a warning that all data will be erased. Read it, then tap Reset or Delete All to confirm.

The phone will ask you to enter your PIN, pattern, or password to confirm you own it. Do that, then tap Reset again. The phone will restart and show a progress bar. Do not turn it off. The whole process usually takes 5 to 15 minutes, and the phone may restart two or three times.

When it's done, you'll see the initial setup screen. Sign in with your Google account, and the phone will restore your contacts, calendar, Gmail, and any apps you had installed from the Play Store.

Reset through the recovery menu if the phone won't start

If your Samsung won't turn on or gets stuck in a boot loop, you can reset it through the recovery menu. The button combination varies by model, but for most Samsung phones it's: hold Power + Volume Up together until the Samsung logo appears, then release Power but keep holding Volume Up until the recovery menu loads.

You'll see a menu with options like "Reboot System Now" and "Wipe Data / Factory Reset". Use the Volume buttons to highlight Wipe Data / Factory Reset, then press Power to select it. The phone will ask you to confirm — highlight Yes and press Power.

The reset will run without any interface. You'll see text scrolling on the screen. When it finishes, you'll return to the recovery menu. Select Reboot System Now and the phone will restart into the setup screen.

If you're not sure which buttons your model uses, search "Samsung [your model number] recovery menu" — the exact combination is different for Galaxy S, Galaxy A, Galaxy Z, and older models.

What to do if you're locked out and want to avoid erasing data

If you've forgotten your PIN or pattern, a factory reset will erase everything. Before you go that route, try Samsung Find Mobile (findmobile.samsung.com) or Google Find My Mobile (google.com/android/find). Both can unlock your phone remotely without erasing it, as long as you can sign in with your Samsung or Google account on a computer.

If neither of those works, or if you don't remember your account password, a factory reset is your only option to regain access. After the reset, you can set a new PIN and sign back in.

Restoring your data after the reset

When you turn on the phone after a factory reset, it will walk you through setup. Sign in with the same Google account you used before. The phone will automatically restore:

  • Contacts stored in Google Contacts
  • Gmail and calendar events
  • Photos and videos in Google Photos (if you had backup turned on)
  • Apps from the Play Store that you had installed
  • SMS and call history (if you had that backed up)

If you also use Samsung Cloud, sign in with your Samsung account during setup and it will restore photos, documents, and settings you backed up there. The restoration happens in the background over the next few minutes — you don't have to do anything.

Photos and messages stored only on the phone's internal storage, and not backed up to Google or Samsung Cloud, cannot be recovered after a factory reset.

Why the phone is slow or stuck after a reset

Right after a factory reset, your phone may feel slow for the first 10 to 20 minutes. This is normal — the phone is indexing files, downloading apps from the Play Store, and syncing data from your Google account all at once. Let it sit on Wi-Fi and don't interrupt it.

If the phone is still slow or unresponsive after an hour, restart it once. If it's still having problems, the issue may not have been software-related — a hardware problem like a failing storage chip or battery can cause the same symptoms. At that point, contact Samsung support or visit a repair shop.

When to call Samsung support instead of resetting

A factory reset solves most software problems, but not all. If your phone is overheating, the battery drains in an hour even when you're not using it, or the screen is cracked or unresponsive, a reset won't help. Those are hardware issues.

If you're locked out and can't remember your Google or Samsung account password, you'll need to recover that password before you can set up the phone after a reset. Go to accounts.google.com or samsung.com/account and use the account recovery process — it usually involves confirming your identity through a recovery email or phone number.

If you've tried a factory reset and the phone still won't start or keeps crashing, contact Samsung support at samsung.com/us/support or visit a carrier store. They can run diagnostics to see if there's a deeper problem.

Frequently Asked Questions

Will a factory reset remove viruses or malware?

Yes, a factory reset will remove most malware because it erases everything and reinstalls the operating system. However, if malware is in your Google account itself (like a compromised password), it could reinfect the phone when you sign back in. After resetting, change your Google password before signing in, and check your account recovery options to make sure no one else has access.

Can I undo a factory reset?

No, a factory reset is permanent and cannot be undone. Everything not backed up to Google or Samsung Cloud is gone. This is why backing up before you reset is critical. If you realize too late that you needed something, your only option is to check if Google Photos or Samsung Cloud has a version of it.

How long does a factory reset take?

The reset itself usually takes 5 to 15 minutes, depending on how much data is on the phone. After that, setup and data restoration can take another 10 to 30 minutes depending on your internet speed and how many apps you had installed. Don't turn off the phone during any of this.

Do I need to remove my SIM card before resetting?

No, you don't need to remove the SIM card. A factory reset doesn't affect the SIM — your phone number and carrier service will work the same after the reset. You may need to re-enter some carrier settings, but the SIM itself stays in the phone.

What if the factory reset gets stuck or doesn't finish?

If the reset appears to be stuck for more than 20 minutes, try a hard restart: hold Power until the phone turns off completely, wait 30 seconds, then turn it back on. If it's still stuck in recovery, the phone may have a hardware problem. Contact Samsung support or visit a repair shop — do not keep trying to reset it.