The fastest way depends on your carrier and phone type
You cannot change your phone number through your phone itself — the number is stored on your carrier's network, not on the device. To change it, you contact your carrier directly by phone, through their website, or in person at a store. Most carriers let you request a new number online in minutes, though some require a call. The process is free if you have not changed your number recently (usually within the last 30 days), and the new number takes effect within hours or a few days depending on the carrier.
Your phone will not automatically know about the change. After your carrier activates the new number, you need to update it in your contacts app, your email settings, and any accounts that use it for two-factor authentication. This is the part that takes real time — not the carrier switch itself.
Key Takeaways
- Contact your carrier by phone, website, or store visit to request a new number; you cannot do this through your phone's settings.
- The change is free if you have not switched numbers in the last 30 days, and usually takes effect within hours to a few days.
- After the carrier activates your new number, update it in your contacts app, email accounts, and any services that send you security codes.
- Tell people who contact you regularly about the change, and consider keeping your old number active for a few days if possible to catch missed messages.
How to request a new number from your carrier
Call your carrier's customer service line — the number is on your bill or on the back of your SIM card. Tell them you want to change your phone number. They will ask you to verify your account (usually the last four digits of your Social Security number or your account PIN), then offer you a new number from available options in your area code, or let you choose from a list. Some carriers let you keep the same area code; others may assign you a different one depending on availability.
If you prefer not to call, most major carriers offer online number changes through their website or mobile app. Log in to your account, find the phone number or account settings section, and look for an option to change or update your number. The process is the same — you verify your identity and select or accept a new number. A few carriers require you to visit a physical store, but this is less common.
Once you confirm the change, the carrier will tell you when it takes effect. This is usually within a few hours, but can take up to a few business days. During this window, calls and texts to your old number may still reach you, or they may not — it depends on the carrier's system. Your new number will work immediately once the switch is complete.
Update your phone after the number change
When your new number is active, your phone will not automatically reflect it. Open your contacts app and update your own contact card with the new number. This matters because when you call someone, they see your number on their end, and if your phone still shows the old one, you may get confused about which number is actually yours.
Check any email accounts linked to your phone number for two-factor authentication. Log into your email provider's security settings and update the phone number used for recovery codes or verification texts. Do the same for any banking apps, social media accounts, or other services that send you security codes by text. If you do not update these, you may lock yourself out of your accounts if you lose access to your old number.
If you use your phone number as a backup recovery method for accounts (rather than as the primary authentication method), update those too. This includes cloud storage, password managers, and any service that might need to contact you to confirm your identity.
Notify people who contact you regularly
Send a text or email to friends, family, and colleagues with your new number. Include a note that your old number will no longer work after a certain date. If your carrier allows you to keep your old number active for a few days (some do, some do not), mention that in your message — it gives people a window to update their contacts.
Update your voicemail greeting on your new number to say it is your new number, so people who reach it know they have the right contact. If you had a voicemail greeting on your old number, you can leave it as-is or delete it; the old number will eventually be reassigned to someone else, and they will not want your greeting.
What happens to your old number
Your old number does not disappear immediately. Carriers typically hold it for 30 to 90 days before reassigning it to another customer. During this time, calls and texts to your old number will not reach you — they will either fail or eventually reach whoever gets assigned that number next. This is why updating your accounts and notifying people matters: once the grace period ends, someone else owns your old number.
If you realize you made a mistake and want your old number back, contact your carrier within the grace period. They may be able to restore it, though this is not may provide and may incur a fee depending on the carrier's policy. After the grace period, your old number is gone.
Fees and restrictions
Changing your number is free if you have not done so in the last 30 days. Most carriers enforce a 30-day waiting period between changes to prevent abuse. If you try to change your number again within 30 days, you may be charged a fee (typically $15 to $25) or denied the change altogether.
Some carriers charge a fee if you change your number more than once per year, or if you request a specific number that is not in the standard available pool. Ask your carrier about their specific policy before requesting the change. If you are switching carriers entirely, you can often port your old number to the new carrier instead of changing it — that is a different process and is free by law.
If you cannot reach your carrier or the change fails
If you call customer service and cannot get through, try the carrier's website or mobile app — most offer number changes online now. If the online option is not available or you get an error, try again at a different time; the system may be temporarily down.
If your carrier denies the change and you are within the 30-day waiting period, you will have to wait. If they deny it for another reason, ask why — it may be a billing issue, a fraud flag, or a technical problem that can be resolved. If you are still stuck, visit a physical store location; staff there can sometimes override online restrictions or process the change manually.
Frequently Asked Questions
Will changing my number affect my service or data plan?
No. Your plan, data allowance, and billing stay exactly the same. Only the phone number itself changes. Your carrier will send you a confirmation with your new number, and your bill will reflect it starting with the next cycle.
Can I keep my old number if I switch carriers?
Yes, through a process called number porting. Contact your new carrier and ask them to port your number from your old carrier. You will need your account number and PIN from the old carrier. This is free by law and usually takes a few days. It is different from changing your number with the same carrier.
What if I change my number and then want it back?
Contact your carrier within 30 to 90 days (the grace period varies by carrier). They may restore your old number, but this is not may provide and may cost a fee. After the grace period, your old number is reassigned and cannot be recovered.
Do I need to tell my bank or insurance company about my new number?
Yes, if they use your phone number for account recovery or two-factor authentication. Log into each account online and update the number in your security settings. This prevents you from getting locked out if you need to verify your identity.
Will my contacts automatically update to my new number?
No. Your contacts will not know your new number unless you tell them. Send a message to people who contact you regularly, and update your own contact card in your phone's contacts app so you remember which number is yours.