How to Factory Reset a Phone Safely
A factory reset wipes a phone back to a clean slate — perfect before selling or to fix a stubborn fault. Do it in the right order and you lose nothing; skip a step and you risk a locked, unusable device.
A factory reset erases everything on a phone and returns its software to the state it left the factory in — no apps, no photos, no accounts. It’s the right move before you sell or give away a device, and it’s a powerful last resort for a phone that’s crashing, sluggish or misbehaving. The reset itself is easy. What matters is the order: back up your data, then sign out of your accounts to clear the anti-theft lock, and only then erase. Get that sequence wrong and you can lose precious photos or hand over a phone that stays locked to your account and is useless to the new owner.
Key takeaways
- Back up first. A reset permanently deletes everything — photos, messages, apps — so save a copy to the cloud or a computer before you start.
- Sign out of your account. Turn off Find My and sign out of your Apple Account (iPhone) or remove your Google account (Android) to clear activation lock.
- Skipping the sign-out leaves the phone locked to you — the new owner can’t use it, and you may have to unlock it remotely later.
- A reset wipes your data and settings but does not downgrade the phone or remove it from any carrier or finance agreement.
What a factory reset actually does
A factory reset deletes all of your personal content and settings and reinstalls the phone’s operating system fresh, so it boots up to the welcome screen as if brand new. That clean slate is exactly why it’s useful in two situations: handing the phone to someone else, where you want every trace of your data gone; and troubleshooting, where a deep software problem — constant crashes, mystery slowdowns, a setting you can’t undo — is cured by starting over. Because the wipe is permanent and complete, treating the backup and sign-out as non-negotiable first steps is the whole game.
Step 1: back up everything first
This is the step people regret skipping. Once the reset runs, anything not backed up is gone for good — so make a copy now.
iPhone
Open Settings → [your name] → iCloud → iCloud Backup and tap Back Up Now, or plug into a computer and back up there. Confirm the backup’s date before you continue.
Android
Open Settings → Google → Backup (wording varies by brand) and tap Back up now. Photos sync separately in Google Photos — check they’re uploaded.
Double-check the essentials
Make sure photos, contacts and messages are safely copied. If you’re moving to a new device, our guide on transferring data to a new phone covers the smoothest path.
For the bigger picture on keeping copies safe long term, see how to back up your data — the same 3-2-1 thinking applies to phones.
The most-skipped step: sign out before you wipe. Modern phones have anti-theft locks — Activation Lock on iPhone, Factory Reset Protection on Android — tied to your account. If you erase without signing out, the phone can demand your account login on the next setup, leaving the new owner locked out. Always remove your account first.
Step 2: sign out and remove the lock
On an iPhone, go to Settings → [your name], scroll down and tap Sign Out, entering your Apple Account password to turn off Find My and Activation Lock. (Settings → General → Transfer or Reset iPhone → Erase All Content and Settings also signs you out as part of the erase, which is the cleanest route — covered below.)
On Android, open Settings → Accounts (or Passwords & accounts), tap your Google account and choose Remove account. This clears Factory Reset Protection so the phone won’t demand your Google login after the wipe. If you’ve set a screen lock, remove or remember it too.
If you’re selling, also remove the SIM and any microSD card, and unpair a paired smartwatch first. Note your reset doesn’t end a carrier contract or device-finance plan — those are separate agreements with your provider.
Reset an iPhone (Erase All Content and Settings)
Open the erase screen
Go to Settings → General → Transfer or Reset iPhone, then tap Erase All Content and Settings. This is the proper full wipe, not the lesser “Reset” options.
Confirm and sign out
You’ll be asked for your passcode and Apple Account password. Entering it turns off Find My and Activation Lock, then begins the erase. Keep the phone on power.
Wait for the welcome screen
The phone restarts and arrives at the “Hello” setup screen — that confirms it’s wiped. Leave it here for the new owner, or set it up again yourself.
Reset an Android phone (Erase all data)
Android wording varies a little by brand (Samsung, Google Pixel, etc.), but the path is consistent:
Find the reset option
Open Settings → System → Reset options (on Samsung: Settings → General management → Reset). Choose Erase all data (factory reset).
Review and confirm
The screen lists the accounts that will be removed. Confirm you’ve backed up, enter your PIN or pattern, and tap Erase all data.
Let it finish
The phone wipes and reboots to the initial setup screen. If it asks for a previously synced Google account, that account wasn’t removed first — sign in to clear it.
| Before you reset | iPhone | Android |
|---|---|---|
| Back up | iCloud Backup or a computer | Google Backup + Google Photos |
| Clear the anti-theft lock | Sign out of Apple Account (turns off Activation Lock) | Remove Google account (clears Factory Reset Protection) |
| Remove hardware | SIM card | SIM card and microSD card |
| Do the wipe | Erase All Content and Settings | Erase all data (factory reset) |
After the reset
If you’re keeping the phone, set it up and restore from the backup you made; everything returns where you left it. If you reset to fix a fault, restoring from a backup can reintroduce the same problem — so for a stubborn issue, try setting up as new first to see if a clean start fixes it. For a phone that simply felt slow, a reset is rarely necessary; our lighter-touch guide on speeding up your phone often does the job without erasing anything. And if you wiped something you actually needed, act fast and read how to recover deleted files — though a completed factory reset is very hard to undo.
Selling the phone? After the wipe, verify the device shows the fresh setup screen and isn’t asking for any account. If you ever can’t get to the phone but signed in elsewhere, you can still remove it from your account remotely via Find My (iPhone) or Find My Device (Android) to lift the lock for the buyer.
When to reset — and when not to
Good reasons to factory reset: selling, trading in or giving away the phone; a serious software problem that survives restarts and updates; or wanting a genuinely clean start. Reach for something gentler first when the phone is merely slow, low on space or playing up in one app — restarting, freeing storage (see how to free up storage) or clearing an app’s data usually fixes those without the upheaval of a full wipe and lengthy restore. A factory reset is a big hammer; use it when the problem is genuinely a big nail.
Frequently asked questions
Will a factory reset delete everything on my phone?
Yes. A factory reset permanently erases all your photos, messages, apps, accounts and settings, returning the phone to how it left the factory. That is exactly why you must back up everything to the cloud or a computer before you start, because anything not backed up cannot be recovered afterwards.
Why do I need to sign out of my account before resetting?
Because of anti-theft locks: Activation Lock on iPhone and Factory Reset Protection on Android tie the phone to your account. If you wipe without signing out, the phone can demand your account login on the next setup, leaving a new owner locked out. Signing out first clears the lock so the phone is ready to use.
How do I factory reset an iPhone?
Back up first, then go to Settings, General, Transfer or Reset iPhone, and tap Erase All Content and Settings. You will enter your passcode and Apple Account password, which turns off Find My and Activation Lock and begins the erase. The phone restarts to the welcome screen when it is done.
Does a factory reset remove the phone from my carrier or finance plan?
No. A reset only wipes the data and settings on the device. Any carrier contract, SIM lock or device-finance agreement is separate and stays in place. Contact your provider to settle or transfer those, and remember to remove your SIM card before handing the phone over.
Will a factory reset fix a slow phone?
It can fix deep software problems by starting fresh, but it is a drastic step for simple slowness. Restarting the phone, freeing up storage and closing or clearing a misbehaving app usually help without erasing anything. Save the full reset for serious faults or before selling the device.
Sources & further reading
- Apple — What to do before you sell, give away, or trade in your iPhone
- Google — Reset your Android device to factory settings
- Apple — Remove Activation Lock
This guide is independently produced. We reference primary documentation from device makers and security authorities. Tudug is reader-supported and may earn from ads.
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