The fastest way to find your phone number

Your phone number is usually displayed on your phone's settings screen, in your carrier's app or website, or by calling your carrier's customer service line. On most phones, you can also dial *#100# (Android) or check Settings > Phone > My Number (iPhone), though not all carriers support these methods.

If you need it right now and your phone is working, the easiest route is to open your carrier's app — Verizon, AT&T, T-Mobile, and most regional carriers show your number prominently on the account page. If you do not have the app installed, you can log into the carrier's website from any computer or another phone.

If you have lost access to your phone entirely, call your carrier's customer service number from any phone. You will need to verify your identity — usually with your account PIN, the last four digits of your Social Security number, or answers to security questions you set up when you opened the account.

Key Takeaways

  • Your phone number appears in your phone's Settings menu, your carrier's app, or your carrier's website without needing to call anyone.
  • If your phone is off or lost, your carrier can tell you your number over the phone after you verify your identity with a PIN or security questions.
  • Dialing *#100# on Android or checking Settings > Phone > My Number on iPhone works on many networks but not all carriers support these codes.
  • Your carrier's customer service number is printed on your bill, on your SIM card packaging, or on the carrier's website.

Finding your number on Android phones

On Android, open Settings and scroll down to find "About phone" or "Phone information." Tap it, then look for "Phone number," "My phone number," or "Status." The number should appear on that screen. If it does not show up, your carrier may not have provisioned it in the phone's system yet — this sometimes happens with new phones or recently activated lines.

Some Android phones also let you dial *#100# to see your number displayed on the screen. This works on many carriers but not all, so if nothing happens when you dial it, try the Settings route instead. You can also try *#62# on some networks, though this is less reliable.

Finding your number on iPhones

On iPhone, open Settings, tap "Phone," and look for "My Number" at the top of the screen. Your phone number should appear there. If the field is blank or says "Unknown," your carrier has not yet sent the number to your phone — contact your carrier to have them push the information to your device.

iPhones do not support the *#100# dialing method, so the Settings menu is your only built-in option. If Settings does not show your number, your carrier's app or website is the next fastest way to find it.

Checking your carrier's app or website

Every major carrier has a mobile app and a website where you can log into your account and see your phone number. Open the app or go to the carrier's website, sign in with your account username and password, and look for "Account," "My Account," "Account Overview," or "Phone Numbers." Your number should be displayed prominently.

If you do not remember your password, use the "Forgot Password" link on the login page. You will need to verify your identity — usually by entering the email address or phone number associated with your account, then confirming a code sent to that email or phone. Once you are logged in, finding your number takes seconds.

What to do if your phone is lost or off

If your phone is not available, call your carrier's customer service number. You can find this number on your bill, on the SIM card packaging, or by searching "[Carrier Name] customer service" online. When you call, explain that you need to know your phone number and be ready to verify your identity.

Most carriers will ask for your account PIN (a four-digit code you set when you opened the account), the last four digits of your Social Security number, or answers to security questions. Once you verify, the representative will give you your phone number when ready. This process usually takes less than five minutes.

Why your phone might not show your number

If your phone's Settings menu shows "Unknown" or a blank field, the most common reason is that your carrier has not yet sent your phone number to the device. This happens most often with newly activated phones or when you switch carriers. The fix is straightforward: contact your carrier and ask them to provision your number to your phone.

Another possibility is that your phone is set to airplane mode or has no network connection. Turn off airplane mode and make sure you have a signal, then check Settings again. If the number still does not appear after a few hours, restart your phone and try once more — sometimes the system just needs time to sync.

Finding a number for someone else's phone

If you need to know someone else's phone number, ask them directly — they can check their own Settings or carrier app in seconds. If they do not know it themselves, they can use the same methods described above. You cannot look up someone else's phone number through their carrier without their permission and account access.

If you are trying to reach someone and do not have their number, ask a mutual contact, check old text messages or emails where they may have shared it, or look for them on social media where they might have posted it. These are the only reliable ways to find a number that is not your own.

Frequently Asked Questions

What if I just got a new phone and it does not show my number?

New phones sometimes take a few hours to receive your phone number from the carrier. Restart the phone, wait a few hours, and check Settings again. If it still does not appear, contact your carrier and ask them to push the number to your device — they can usually do this in one call.

Can I find my phone number if my phone is completely dead?

Yes. Call your carrier's customer service number from another phone and verify your identity with your PIN or security questions. They will give you your number when ready. You can find the carrier's customer service number on your bill or by searching online.

Does *#100# work on all phones?

No. This code works on many Android phones but not all carriers support it, and iPhones do not recognize it at all. If nothing happens when you dial it, use the Settings menu or your carrier's app instead — both work on every phone.

What if I forgot my carrier's customer service number?

Search "[Your Carrier Name] customer service number" online and you will find it when ready. You can also check your bill if you have a paper copy, or look at the SIM card packaging if you still have it. Most carriers also list the number on their website's login page.

Can I change my phone number if I do not like the one I have?

Yes, most carriers allow you to change your number for free once per account, though some charge a small fee. Contact your carrier's customer service and ask about changing your number — they will walk you through the process and may ask you to verify your identity.