ChatGPT and OpenAI Phone Verification: When It's Required and How to Handle It

OpenAI's verification rules have changed several times since ChatGPT launched, and they can differ between the ChatGPT app and the developer platform, between countries, and between accounts. That's why people get conflicting answers about whether a phone number is needed. This guide explains the situations where phone verification typically comes up, why some numbers are refused, how per-number limits work, and how to verify your own account without handing over your personal number. Because OpenAI updates its policies, treat specifics here as typical behavior rather than fixed rules, and check OpenAI's help center for the latest.

When does OpenAI ask for a phone number?

For many people, signing up for ChatGPT only requires an email address or a sign-in with Google, Microsoft or Apple. OpenAI has also offered sign-up with a phone number in some regions. Phone verification may still appear in a few situations, and the exact triggers aren't published.

• During sign-up, for some accounts or regions.
• On the OpenAI developer platform, for example before using certain API features.
• When OpenAI's systems detect unusual activity on an account.
• When enabling some account security options.

Why is my number refused?

OpenAI's help documentation has stated that it doesn't support VoIP or landline numbers for verification. That rules out many app-based numbers, including Google Voice and TextNow. If your number is refused right after entering it, the line type is the most likely reason.

Formatting is the other usual cause. Select the correct country and enter the number without a leading 0 for UK numbers and without an extra 1 for US and Canadian numbers. Codes are sent by SMS, so the number must be able to receive texts.

How many accounts can one number verify?

OpenAI limits how many accounts a single phone number can verify. The exact number isn't something to rely on, because it has changed over time. If you see a message that the number has already been used, that number can't verify another account, even if the earlier accounts were yours.

This is why shared family numbers, old work numbers and free public inbox numbers often fail. Public inbox numbers are almost always over the limit, and anyone could see your code there.

If you share a household number, it's usually simplest for each person to verify their own account with their own mobile number. Workspace and team plans also let an organization add members by email, which avoids per-number limits for colleagues altogether.

Step by step

1. Check whether it's requiredTry signing up with email or a Google, Microsoft or Apple login first.
2. Use a mobile numberIf asked, use a carrier mobile number, not VoIP or landline.
3. Enter it correctlyPick the right country and remove any leading 0 or extra 1.
4. Enter the codeType the SMS code promptly before it expires.
5. Secure the accountTurn on multi-factor authentication with an authenticator app.

Using a temporary number for OpenAI

If you'd rather not link your personal number, a private temporary number can work for the verification step. Noir SMS numbers are carrier mobile numbers rather than VoIP, so they usually pass checks that block VoIP, though OpenAI can still refuse any number. Choose OpenAI as the service and your country, enter the number in the format above, and the code appears in your dashboard with a sound alert.

If OpenAI refuses the number or nothing arrives, cancel after two minutes for an instant refund, or wait for the automatic refund after 20 minutes. Afterward, secure the account with multi-factor authentication through an authenticator app and keep your email current, because the temporary number will be recycled and shouldn't be your recovery method. Use it only for your own account and within OpenAI's terms; creating multiple accounts to get around usage limits isn't an acceptable use.

What if OpenAI asks for more than a phone number?

Some OpenAI platform features have used organization or identity verification that involves government ID. That's a different process from phone verification, and temporary numbers have no role in it. Noir SMS isn't for identity checks of any kind; follow OpenAI's own instructions for those.