Why You Should Stop Giving Out Your Real Phone Number

Your phone number is one of the few details that is the same on every service and hard to change. That makes it a key that links your accounts, and the more places that hold it, the more places it can leak from. You do not have to give it to every signup.

Updated November 2026.

What can go wrong

• It gets shared and sold. Many services pass phone numbers to partners or advertisers. Others lose them in data breaches. Once it is out, it stays out.
• It links your accounts. The same number across services lets data brokers and attackers tie them together.
• Spam and scam calls and texts. Numbers that leak get called and texted constantly, including phishing messages.
• SIM-swap attacks. If a criminal convinces your carrier to move your number to their SIM, they can receive codes meant for you. The more accounts rely on that number, the worse this is. If codes suddenly stop arriving, contact your carrier.

Which accounts deserve your real number

Use your real number for the accounts you cannot afford to lose access to:

• Banks, payment apps and anything that holds money.
• Your main email.
• Work accounts and accounts that identify you.

For these, a code on a number you control, plus an authenticator app or passkey, is safer than any shortcut.

Which accounts do not

For low-stakes accounts, you can use something else:

• A marketplace you are trying out.
• A newsletter, a download or a free trial.
• A game or app you may delete in a week.

Options: a second prepaid SIM, an eSIM, or a one-time number that receives the code for you. Our US mobile numbers start at $0.50 per verification (services, pricing). We cannot guarantee a platform will accept a number. If the code does not arrive, you get a full refund.

Practical steps

1. Use two-step verification with an app, not text, wherever you can.
2. Ask your carrier for a port-out PIN or SIM lock.
3. Check where your number has leaked with a breach-notification service, and treat unexpected "verify your number" messages as suspicious.
4. Do not give your number to a service that does not need it.

When not to use a temporary number

If you may need to recover the account, you need a number that will be yours later. A one-time number is gone in minutes. A rental runs one day to one year (rentals) and then ends. See also burner numbers for verification.

Frequently asked questions

Is it illegal to use a different number for signups?

Not in general. Follow the terms of the service you sign up for.

Does a temporary number make me anonymous?

No. It keeps your own number off that signup. Other details still identify you.

What is the safest way to receive codes?

An authenticator app or a passkey, where the service supports it.