The quickest way to check your mobile number

The easiest method depends on your phone type and carrier. On most phones, you can dial *#100# or *#101# to see your number displayed on screen within seconds. If that does not work, open your phone's Settings app, go to About Phone (or About Device), and look for "My Phone Number" or "Phone Identity" — the exact wording varies by manufacturer. Some carriers also let you text a code to a specific number; for example, AT&T users can text "INFO" to 611611.

If your phone does not show your number in Settings, your carrier may not have provisioned it in the device's system memory. This is common with prepaid plans or newly activated SIMs. In that case, check your carrier's website or app, or call customer service — they can tell you your number in under a minute.

Key Takeaways

  • Dialing *#100# or *#101# displays your number instantly on most phones without making a call.
  • Your phone's Settings app under "About Phone" or "Phone Identity" often shows your number if the dial codes do not work.
  • Prepaid and newly activated SIMs may not store your number in the device, so you will need to check with your carrier directly.
  • Your carrier's website, app, or customer service line can confirm your number even if your phone cannot display it.

Using USSD codes to retrieve your number

USSD codes are short commands that phones send to your carrier's network to request information. The codes *#100# and *#101# work on most Android phones and many older feature phones, though not all carriers support them. When you dial the code, your phone sends it to the network, and your number appears in a popup window — no call is placed, so you are not charged.

Different carriers sometimes use different codes. Verizon users may try *611 (which connects to customer service), while T-Mobile users can dial 611 and ask. If the standard codes do not work on your phone, your carrier's customer service line can walk you through their specific method in seconds.

Finding your number in phone settings

On Android phones, open Settings, scroll to About Phone (or Device Information), and look for "My Phone Number," "Phone Number," or "Phone Identity." The label and location vary by manufacturer — Samsung, Google Pixel, and other brands place it slightly differently. If you see the number there, that is your carrier-assigned mobile number.

On iPhones, go to Settings > General > About and look for "Phone Number" near the top of the screen. If the field is blank or missing, your carrier has not stored your number in the device's system, which is not uncommon with prepaid or recently activated accounts. In that case, you will need to contact your carrier.

Checking your number through your carrier's app or website

Every major carrier — AT&T, Verizon, T-Mobile, and regional providers — displays your phone number in their official app or website. Log in with your account credentials, go to Account Settings or My Account, and your number appears under "Phone Number," "Mobile Number," or "My Services." This method works even if your phone does not display the number.

If you do not have the app installed, visit your carrier's website on a computer or mobile browser. The login page is usually on the homepage. Once you are logged in, the number is typically visible on the account dashboard or in a settings menu. This is also the most reliable way to confirm your number if you have multiple lines on one account.

Calling customer service to confirm your number

If none of the above methods work, call your carrier's customer service line. You will find the number on your bill, on the back of your SIM card, or on your carrier's website. When you call, you may be asked to verify your identity with your account PIN, the last four digits of your Social Security number, or answers to security questions. After verification, the representative will read your number back to you.

This method takes a few minutes but is may provide to work. It is also useful if you suspect your number has been reassigned or if you are unsure which number belongs to which SIM card when you have multiple devices.

Why your phone might not show your number

Your phone displays your number only if your carrier has stored it in the SIM card or the device's system memory during activation. Prepaid plans, newly activated accounts, and SIMs transferred between phones sometimes do not have this information loaded. Switching phones or carriers can also cause the number to disappear from Settings temporarily.

If your phone does not show your number but you can make and receive calls, your carrier has your number on file — it is just not stored locally on the device. This does not affect your service. Contacting your carrier or checking their app will always show you the correct number, even if your phone cannot.

Frequently Asked Questions

Will dialing *#100# or *#101# cost me money?

No. USSD codes send a request to your carrier's network and display the result on your phone without placing a call. You are not charged for the data or the request. If your phone shows an error, it simply means your carrier does not support that code.

What if I have multiple phone numbers on one SIM card?

Most SIM cards hold only one primary number. If your carrier offers multiple numbers on a single line (sometimes called "virtual numbers" or "secondary numbers"), they appear in your carrier's app or website under Account Settings, not in your phone's basic Settings. Call your carrier if you are unsure how many numbers are attached to your SIM.

Can I find my number if my phone is locked or broken?

Yes. Log into your carrier's website or app from any device with internet access, or call customer service from another phone. You do not need access to the locked or broken phone itself — your carrier has your number on file regardless of the device's condition.

Is my number the same as my SIM card number?

No. Your mobile number is what people call to reach you. Your SIM card has a separate identification number (the ICCID) printed on it. The two are not the same. When you dial *#100#, you see your mobile number, not your SIM card number.