Your WhatsApp number is the phone number you registered with when you set up the app
WhatsApp does not assign you a separate number. The number WhatsApp uses is straightforward your mobile phone number — the same one your phone company gave you. When you first opened WhatsApp, you entered this number and received a verification code by text message. That number is now your WhatsApp account identifier.
If you are not sure which number that is, the fastest way to find it is to open WhatsApp, tap Settings (the gear icon at the bottom right on iPhone, or the three dots at the top right on Android), then tap Account. Your registered phone number appears at the top of that screen.
Knowing your WhatsApp number matters because it is how other people find and contact you in the app. It is also the number you would need if you ever switched phones or reinstalled WhatsApp, because WhatsApp uses it to restore your account on a new device.
Key Takeaways
- Your WhatsApp number is your actual mobile phone number, not a separate account number the app creates for you.
- You can see your registered number in Settings > Account on any device where WhatsApp is installed.
- Other people search for you in WhatsApp using this phone number, so it is how they add you as a contact.
- If you change your phone number, you will need to update it in WhatsApp or your contacts will not be able to reach you in the app.
How to locate your number in the WhatsApp app
Open WhatsApp and look at the bottom of the screen. On iPhone, tap the Settings icon (it looks like a gear). On Android, tap the three vertical dots at the top right and select Settings. Either way, you will see a menu with several options.
Tap Account. The first line on this screen shows your phone number in the format it was registered — usually with a country code at the start (like +1 for the United States). This is your WhatsApp number. Write it down if you need to share it with someone, or take a screenshot for your records.
If you do not see a phone number in the Account section, it may mean WhatsApp did not complete setup properly. In that case, uninstall the app, reinstall it from the App Store or Google Play, and go through the verification process again. WhatsApp will send you a code by text message to confirm the number.
What to do if you cannot find your number in Settings
Sometimes the Account section does not display your number clearly, or the Settings menu looks different than expected. This usually happens if your WhatsApp version is outdated. Go to the App Store (iPhone) or Google Play (Android), search for WhatsApp, and tap Update if an update is available. Then return to Settings > Account.
If updating does not help, try signing out and back in. On iPhone, go to Settings > Account > Logout. On Android, go to Settings > Account > Delete Account (this removes the app from your phone but does not delete your account). Reinstall WhatsApp, enter your phone number, and verify it with the code WhatsApp sends by text. Your number will then appear in the Account section again.
If you still cannot see your number after these steps, your phone number may not be properly linked to your WhatsApp account. Contact your phone company to confirm your number is active, then try the reinstall process once more.
How other people find you using your WhatsApp number
When someone wants to contact you on WhatsApp, they do not search for a username or email address. They search for your phone number. They open WhatsApp, tap the message icon or the plus sign to start a new chat, and type in your phone number. If you have WhatsApp installed and that number is registered to your account, you will appear in their search results.
This is why it matters that your WhatsApp number is correct and current. If you gave someone your old number, or if you switched to a new number without updating WhatsApp, they will not be able to find you. They will either see no results or find the wrong account.
You can also share your WhatsApp number directly by sending it to someone through text, email, or any other method. Some people write it on business cards or social media profiles so others know how to reach them in WhatsApp.
Changing your WhatsApp number
If you got a new phone number from your carrier, you need to update it in WhatsApp so your contacts can still reach you. Open WhatsApp, go to Settings > Account, and tap Change Number. Enter your old number, then your new number. WhatsApp will send a verification code to your new number by text message. Enter that code to confirm the change.
When you change your number in WhatsApp, your account and chat history stay the same. Your contacts will see that you changed your number, and you will remain in their contact lists. However, if someone tries to reach you using your old number, the message will not go through — they will need to use your new number.
If you switched phones and got a new number at the same time, you can also reinstall WhatsApp on your new phone and register with the new number. WhatsApp will ask whether you want to restore your chat history from a backup. If you backed up your chats to iCloud (iPhone) or Google Drive (Android) before switching phones, your messages will be restored.
Why WhatsApp uses your phone number instead of a username
WhatsApp chose to use phone numbers instead of usernames because phone numbers are unique, permanent, and something most people already know. You do not have to remember a complicated username or handle. Your contacts already have your number in their phone, so they can find you in WhatsApp without any extra steps.
This design also means WhatsApp does not store a separate database of usernames. It relies on your phone company's records to verify that the number belongs to you. When you register, WhatsApp sends a code to that number to confirm you own it. This makes it harder for someone to impersonate you or create a fake account using your number.
Frequently Asked Questions
Can someone find my WhatsApp number if they do not have it saved in their phone?
No. WhatsApp does not have a public directory or search function that lets someone find you by name alone. They must have your actual phone number to search for you. If they do not have your number saved, they cannot discover your WhatsApp account through the app.
Is my WhatsApp number different from my SIM card number?
Yes. Your phone number is the number people call or text you on. Your SIM card number (also called the IMSI) is a separate identifier stored on the physical chip in your phone. WhatsApp uses your phone number, not your SIM card number. If you switch SIM cards but keep the same phone number, your WhatsApp account stays the same.
What happens to my WhatsApp account if I do not use it for a long time?
WhatsApp does not delete inactive accounts. Your account and chat history remain on WhatsApp's servers. However, if you do not open the app for several months and then switch phones, you may not be able to restore your old chats if your backup expired. Most backup services keep backups for only 30 to 90 days.
Can I use WhatsApp without giving my real phone number?
No. WhatsApp requires a real, working phone number to register. The number must be able to receive text messages so WhatsApp can send you a verification code. You cannot create a WhatsApp account with a fake number or a number that does not belong to you.
If I share my WhatsApp number online, can strangers contact me?
Yes. Anyone who has your phone number can search for you in WhatsApp and send you a message. If you post your number publicly on social media or a website, you may receive messages from people you do not know. You can block unwanted contacts or adjust your privacy settings to control who can see your profile picture and status.