What changing your phone number on your device actually means
Changing your phone number on your phone is not the same as changing your phone number with your carrier. Your carrier (like Verizon, AT&T, or T-Mobile) controls your actual phone number — the one people call or text. What you can change on your device itself is the phone number that appears in your own contacts, your voicemail greeting, or your device settings. This matters because some apps and services read that stored number, and it needs to match what your carrier has on file to work correctly.
If you actually want a new phone number from your carrier, you contact them directly — that is a separate process. This guide covers what you can do on the phone itself.
Key Takeaways
- Your device stores your own phone number separately from what your carrier has on file, and the two can get out of sync.
- On iPhone, you update your stored number in Settings under Phone, and on Android it is usually in Settings under About Phone or SIM Card Information.
- Some carriers let you change your number through their app or website, while others require a phone call to customer service.
- If you got a new SIM card or switched carriers, your device may not have picked up your new number automatically.
- Your voicemail greeting and contact cards may still show your old number even after you update your device settings.
How to update your phone number on an iPhone
On iPhone, your stored phone number lives in Settings. Open Settings, tap Phone, and look for "My Number" at the top. If a number is listed there, you can tap it and edit it. Type in your correct phone number and tap Save. This updates what your iPhone thinks your number is, which affects how some apps display your contact information and how your device identifies itself on the network.
If "My Number" is blank or missing, your carrier may not have sent that information to your SIM card yet. This is common after you switch carriers or get a new SIM. In that case, you can manually enter your number here. Go back to Settings > Phone > My Number and add it yourself.
After you update it, restart your phone to make sure the change takes effect across all apps and services. Some apps cache your number and do not refresh until you restart.
How to update your phone number on Android
Android stores your phone number in a few different places depending on your device and carrier. Start by opening Settings and looking for "About Phone" or "Device Information" — the exact name varies by manufacturer. Scroll down until you find "Phone Number" or "My Phone Number" and tap it. You should be able to edit the number directly. Type your correct number and save it.
If you do not see a phone number field in About Phone, try Settings > SIM Card Information or Settings > Network & Internet > SIM. Some Android phones store the number there instead. If none of these sections show your number, your carrier may not have provisioned it to your SIM card yet.
After you make the change, power off your phone completely and turn it back on. This forces Android to re-read your SIM card information and update all the apps that depend on knowing your phone number.
When your carrier needs to change your number for you
If you want an entirely different phone number — not just updating what your device displays, but actually getting a new number assigned to your account — you contact your carrier, not your phone. Call customer service, visit a store, or log into your carrier's app or website. Most carriers let you request a number change online through your account settings, though some still require a phone call.
When you request a new number from your carrier, they assign it to your SIM card. Your phone should pick it up automatically within a few minutes, but sometimes you need to restart your phone or toggle airplane mode off and on to force it to refresh. Once your carrier has assigned the new number, you should update your voicemail greeting and tell your contacts your new number.
Why your device number and your carrier number can be different
Your phone number exists in two places: on your SIM card (which your carrier controls) and in your device settings (which you can edit). Most of the time they match, but they can drift apart. If you switch carriers, get a new SIM card, or restore your phone from a backup, the number stored on your device might not match what your carrier has assigned. This can cause problems with apps that read your stored number, or with services that expect your device to identify itself correctly on the network.
Your carrier always has the authoritative version. If you are unsure what your real number is, call your carrier or check your account online. Then update your device to match.
Updating your voicemail greeting after a number change
If you changed your phone number, your voicemail greeting might still say your old number. You need to re-record it. On iPhone, open the Phone app, tap Voicemail, tap Greeting, and choose Custom. Record a new greeting that includes your correct number. On Android, open the Phone app, tap More or the menu icon, go to Voicemail Settings, and look for Greeting or Custom Greeting. The exact steps vary by carrier and Android version.
Some carriers let you manage your voicemail through their website or app instead of calling in. Check your carrier's website to see if you can update your greeting that way — it is often faster than calling.
What to do if your phone number is not updating
If you updated your device settings but the number still does not appear correct, try these steps in order: restart your phone, toggle airplane mode off and on, remove and reinsert your SIM card, or factory reset your network settings. On iPhone, go to Settings > General > Reset > Reset Network Settings. On Android, go to Settings > System > Reset Options > Reset Wi-Fi, Mobile & Bluetooth. This clears out old network information and forces your phone to re-read your SIM card from scratch.
If the number still does not update after that, contact your carrier. The problem may be on their end — your SIM card may not have the correct number provisioned, or there may be a delay in the system updating. Your carrier can confirm what number is actually assigned to your account and push it to your device if needed.
Frequently Asked Questions
Can I change my phone number without calling my carrier?
You can update the number stored on your device without calling them, but that does not change your actual phone number. If you want a new number assigned to your account, most carriers now let you do it through their website or app. Check your carrier's website to see if you can request a new number online.
Why does my phone show a different number than what my carrier says?
Your device stores a copy of your number separately from your SIM card. If they do not match, restart your phone or toggle airplane mode to force it to refresh. If that does not work, contact your carrier — they may need to re-provision your number to your SIM card.
Do I need to update my number in my contacts after I change it?
You do not need to update your own contact card unless you want other people to see your new number when they look you up. Your device uses the number on your SIM card for calls and texts, not the number in your contacts. But you should update your voicemail greeting so callers hear the correct number.
What happens to my old number after I change it?
Your old number goes back into your carrier's pool and may be assigned to someone else after a waiting period. If you need to keep the old number, contact your carrier before you request a change — some carriers can port your number to a different service or hold it temporarily.
Will changing my phone number affect my apps or accounts?
Apps that use your phone number for two-factor authentication or account recovery may need to be updated with your new number. Log into each important account (email, banking, social media) and update your phone number in the security settings. This makes sure you can still recover your accounts if you lose access.