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OpenAI and WhatsApp do not accept several number types people commonly call “virtual,” but their rules are different. OpenAI excludes landlines, VoIP, Google Voice, and premium numbers from its documented phone-verification flow; WhatsApp excludes VoIP, toll-free, paid premium, and universal access numbers, and allows landlines only for WhatsApp Business. If verification is required, use a supported mobile number you own and can access. Neither service guarantees that a particular carrier number or SIM will work.
What “virtual number” means in these policies
“Virtual number” is a broad everyday label, not a precise eligibility category in either provider’s guidance. OpenAI and WhatsApp instead name specific types, including VoIP, landline, premium, and toll-free numbers. Their published rules do not establish that all eSIMs or every nontraditional number are blocked. The practical question is whether the number is supported and can receive a code through the channel the service offers.
Which numbers and verification channels each service supports
These are separate verification contexts: OpenAI’s phone check for particular OpenAI tasks and WhatsApp’s registration of a WhatsApp account.
| Service and task | Number rules | Code delivery |
|---|---|---|
| OpenAI phone verification | Excludes landlines, VoIP, Google Voice, and premium numbers. OpenAI describes the eligible category as a supported mobile number. | SMS, or WhatsApp in selected countries when offered in the verification form. The documented flow does not send codes by email or phone call. |
| WhatsApp account registration | Requires an active, supported number that you own and can access. VoIP, toll-free, paid premium, and universal access numbers are unsupported. Landlines are excluded except for WhatsApp Business. | SMS or phone call. An email code is described for logging in to an existing account with an email address previously added; it is not a replacement for the new-number registration code. |
OpenAI says the number types it excludes are often associated with greater instances of fraud or abuse. That is its broad explanation, not a complete description of its risk checks, and it is not a claim that every person using VoIP is fraudulent. WhatsApp lists number exclusions but does not give the same rationale on its registration page.
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Does ChatGPT always require phone verification?
No. OpenAI says phone verification is not generally required to create an account or use ChatGPT. Its current guidance identifies initial API key generation as a task that requires phone verification, and says verification may also be requested for Codex in the ChatGPT desktop app. Do not assume that a phone check is required for every ChatGPT signup or use case.
How OpenAI phone verification works
- Open the verification flow for the task you are completing. Follow its prompts and enter a supported mobile number with the correct country selected.
- Check the delivery options shown in the form. OpenAI documents SMS and, in selected countries, WhatsApp. WhatsApp may not appear for every country or flow; the form is the practical check for your situation.
- Enter the code received through the offered channel. The documented OpenAI flow does not provide the code by email or phone call, so an email address or authenticator app does not substitute for a required phone check.
When OpenAI offers WhatsApp delivery
OpenAI’s Help Center lists WhatsApp as a phone-verification delivery option in the following countries: United Arab Emirates, Egypt, Indonesia, Israel, India, Malaysia, Nigeria, Pakistan, Saudi Arabia, Turkey, Ukraine, and Vietnam. This is a list for OpenAI verification delivery, not a list of countries where WhatsApp account registration is available. Availability can change, so rely on the current verification form rather than assuming the option will appear.
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How to choose a non-VoIP number
If you do not have an eligible number, a mobile carrier line or prepaid SIM with an active mobile number and SMS capability is a reasonable option to investigate. That follows from the published number requirements; neither company promises that a particular carrier, plan, SIM, eSIM, or country will be accepted.
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- Check the number type and local carrier terms before buying or activating a line.
- Use a number you own and can continue to access. A rented, disposable, or shared SMS number is not endorsed by the cited guidance, and WhatsApp explicitly excludes VoIP numbers.
- Confirm that the line can receive the channel the service offers. WhatsApp registration permits SMS or a call; OpenAI’s documented flow offers SMS or, in selected places, WhatsApp.
Number reuse and OpenAI’s API verification limit
OpenAI says a phone number can verify initial API key generation for up to three accounts. The rule is described as rolling out mostly for new users in the United States, Netherlands, France, Spain, United Kingdom, Poland, Germany, Japan, India, Pakistan, Algeria, Uzbekistan, and Ukraine; OpenAI says no other regions are planned. This limit concerns initial API key verification, not the general creation of a ChatGPT account.
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OpenAI also says a consumer whose ChatGPT account was permanently deleted may, in some circumstances, re-register with the same number after 30 days, provided the account was not disabled for a terms or policy violation. Reusing a number this way does not reset the separate three-account limit for initial API key generation. Deleting an account is not a workaround for that limit.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.If a supported number is rejected
A supported number category does not guarantee that every individual number will pass. OpenAI does not provide a universal diagnosis for a particular carrier number being rejected. For certain errors, including errors involving a supported country, its current guidance advises contacting Support and supplying the exact error. Avoid assuming that changing a device, VPN, or number format will solve the problem unless OpenAI’s guidance for that specific error says so.
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