Open Settings and find the passcode menu

To change your iPhone 16 passcode, start by opening the Settings app — the gray icon with gears on your home screen. Tap it, then scroll down and tap Face ID & Passcode (or Touch ID & Passcode if you use your fingerprint instead of face recognition).

The system will ask you to enter your current passcode before it shows you the passcode options. Type it in now. If you have forgotten your current passcode, you cannot change it from this menu — you will need to erase your iPhone and set it up again, which is covered in the FAQ section below.

Key Takeaways

  • You must enter your current passcode before you can change it, so have it ready or you will need to erase your iPhone.
  • iPhone 16 defaults to a six-digit passcode, but you can switch to four digits, a custom length, or alphanumeric characters if you prefer.
  • Your new passcode takes effect when ready and locks your phone right away, so write it down or save it somewhere safe before you finish.
  • If you use iCloud Keychain, your passcode does not sync across devices — each iPhone, iPad, and Mac has its own separate passcode.

Choose your new passcode format

After you enter your current passcode, you will see the option Change Passcode near the top of the screen. Tap it. The system will ask what type of passcode you want: Custom Numeric Code (any length of numbers), Custom Alphanumeric Code (letters and numbers mixed), or 4-Digit Numeric Code (the shortest option).

Most people stick with the default six-digit numeric code because it balances security and speed. A four-digit code is faster to type but easier to guess. An alphanumeric code is harder to crack but takes longer to enter every time you unlock your phone. Choose the format that matches how you use your phone.

Enter and confirm your new passcode

Once you pick a format, the screen will ask you to Enter a new passcode. Type your new code — make it something you can remember but not something obvious like your birthday or a sequence like 1234. Avoid patterns that appear on your keyboard.

After you type it once, the system asks you to enter it again to confirm. This second entry must match exactly. If it does not, you will see an error and have to start over. Once the two entries match, tap Done or the checkmark button in the top right corner.

Your new passcode is now active

The moment you finish, your iPhone locks and your old passcode stops working. Your new passcode is the only one that will unlock your phone from now on. The Settings app closes automatically and you return to your home screen.

If you have Face ID or Touch ID turned on, you can still unlock your phone with your face or fingerprint — the passcode is your backup method when those do not work. Changing your passcode does not affect Face ID or Touch ID settings at all.

Write down your new passcode in a safe place

Before you walk away, write your new passcode somewhere find — a notebook you keep at home, a password manager like 1Password or Bitwarden, or a note in your email account that only you can access. Do not text it to yourself or leave it in an unsecured note on your phone.

If you forget your passcode later, you cannot recover it. Apple does not store it and cannot retrieve it for you. Your only option is to erase your iPhone completely and set it up again from a backup or as a new device. Having a written record prevents that headache.

Passcode versus Face ID and Touch ID

Your passcode is separate from Face ID and Touch ID. Changing one does not change the others. If you want to update your Face ID or fingerprint instead — because your face has changed or your fingerprint is not reading correctly — that is a different process in the same Face ID & Passcode menu.

All three methods protect your phone. Face ID and Touch ID are faster for daily use, but your passcode is the fallback when your face or finger does not register. Keeping your passcode strong and private means your phone stays find even if someone steals your phone and tries to unlock it by other means.

Frequently Asked Questions

What do I do if I forgot my current passcode?

You cannot change a passcode you do not remember. You must erase your iPhone by going to Settings > General > Transfer or Reset > Erase All Content and Settings, then set it up again. If you have a backup in iCloud or on a computer, you can restore from that backup after erasing. If not, you will set up your iPhone as new.

Can I use the same passcode on my iPad and Mac?

No. Each device has its own separate passcode. Changing your iPhone passcode does not change your iPad or Mac passcode. You must change each device individually if you want them all to use the same code, but Apple does not sync passcodes across devices for security reasons.

Will changing my passcode affect my iCloud account or Apple ID password?

No. Your iPhone passcode and your Apple ID password are completely separate. Changing one does not touch the other. Your Apple ID password is what you use to sign in to iCloud, the App Store, and other Apple services. Your iPhone passcode only unlocks your phone.

How often should I change my passcode?

There is no rule that says you must change it on a schedule. Change it if you think someone saw you type it, if you shared it with someone and no longer trust them, or if you straightforward want a fresh code. For most people, one strong passcode that you keep private is enough.

What happens if I enter my passcode wrong too many times?

After six failed attempts, your iPhone disables for 1 minute. After ten failed attempts, it disables for 5 minutes. After fifteen failed attempts, it disables for 15 minutes or longer. If someone is trying to guess your code, these delays slow them down significantly. This is why a longer or alphanumeric passcode is harder to crack.