Apple

• This powerful app tells you everything about your iPhone, iPad, or MacBook's battery
• I can't recommend the 15-inch MacBook Air enough, even if it's not for me
• Apple Watch upgrade time? How to choose between Series 8, Ultra, or waiting for Series 9
• I tried Apple Vision Pro and it's far ahead of where I expected

It's easy to forget about your old iPhone when you set up your shiny new one. But after you've signed in to all of your apps, transferred your photos and contacts over, and double-checked that your emails are, indeed, still visible -- don't just put your old phone in a box and forget about it.

It's important to take a few minutes to factory reset your old iPhone, removing all of your personal information and files and wiping away any tracks of user data, especially if you plan on selling or trading it in. 

What is a factory reset? 

Also known as a master reset or hard reset, a factory reset means the complete removal of user data from your phone. A factory reset restores your software to its original manufacturer settings, so it operates as if you never even took the device out of the box.

Why should you do a factory reset? 

To state the obvious, nobody wants their data in a stranger's hands, right? If that reason isn't enough, it's important to mention that if you're trading your phone in and Apple's Find My service is still active, some companies will reject the trade-in and you'll miss out on any credits.

Wiping your phone only takes a few minutes, but it's incredibly simple to do.

How to factory reset your iPhone

Apple made the process of resetting or wiping your iPhone easy with iOS 15, so it's best that your iPhone -- even if it's about to be let go -- is updated to the latest software version. Now, instead of having to manually turn offFind My iPhoneand Activation Lock before you reset your phone, the latest iOS version takes care of everything for you when you initiate the factory reset.

The reset process is mostly the same on iOS 16, from what we've gathered testing the beta version. 

Step 1: Open the Settings app

To get started, open theSettingsapp on your iPhone, then selectGeneralfrom the list of options.

Step 2: Tap Transfer or Reset

Scroll to the bottom of the page and tapTransfer or Reset iPhone. The next screen will give you the option to prepare your phone to set up another device. You can follow those steps if you're getting ready to transfer any files and app data onto your new iPhone. 

If you've already done that, just tapErase All Content and Settingsat the bottom of the screen. Enter your passcode when prompted.

This photo highlights steps 1-3. Go toSettings>General>Transfer or Reset iPhone>Erase All Content and Settings>Erase This iPhone> pressContinue. 

Screenshots by Jason Cipriani/ZDNet

Step 3: Go to "Erase This iPhone" 

The next screen, titled "Erase This iPhone" at the top, details all of the information that will be erased from your device. 

Here, you'll be informed that any cards, keys, or passes in the Wallet app will be removed. And, yes, Find My and Activation Lock will also be disabled.

Tap the blueContinuebutton. You'll be presented with an iCloud Backup screen that, if you let it run its course, will store one last backup of your iPhone before the internals are erased. 

More: How to reset AirPods on an iPhone

Step 4: Select "Turn Off" 

On the next screen, you'll be asked to enter your Apple ID/iCloud account password. 

This is the step that turnsFind Myoff. After entering your password, tap on theTurn Offbutton in the top-right corner.

It may seem like nothing is happening when you select Turn Off, but give it a second or two before doing anything else. 

In my experience, your phone is trying to turn off Find My during this time, but it lacks any sort of progress indicator.

Step 5: Erase iPhone

Finally, you'll see another popup with a button labeledErase iPhone. If you tap the button, your iPhone will reboot a few times and, once it's done, all of your information will be fully wiped from it.

You'll know it's done when you see the same boot-up screen that welcomed you years ago.

More how-tos

How to set up and use Meta's Threads as a Windows 11 desktop app3 essential Windows tools for troubleshooting (and how to use them)How to use iOS 17's 'Live Voicemail' transcriptions, and which iPhones support itBing Chat now has the highly-requested dark mode. Here's how to turn it on

• How to set up and use Meta's Threads as a Windows 11 desktop app
• 3 essential Windows tools for troubleshooting (and how to use them)
• How to use iOS 17's 'Live Voicemail' transcriptions, and which iPhones support it
• Bing Chat now has the highly-requested dark mode. Here's how to turn it on