What OpenAI (ChatGPT) expects from a number
Before you buy anything, this is what has to be true of the line for OpenAI (ChatGPT) to accept it.
Must be a real cellular number without a prior OpenAI verification history, since one number typically binds to one account or organization.
Needs to receive SMS promptly — OpenAI's verification window isn't generous.
Works for both the consumer ChatGPT signup and organization/API verification, so decide up front which one you're verifying.
Why numbers get rejected on OpenAI (ChatGPT)
Most failures are one of these, and knowing which one you have hit decides whether retrying helps or wastes another attempt.
OpenAI generally limits how many accounts a single phone number can verify, and ties that number to a specific account or organization rather than allowing free reuse across new signups.
The phone gate applies to both the consumer ChatGPT signup and API/organization verification for raising usage limits, so a number that fails one context typically fails the other too.
VoIP and recently-reassigned numbers get flagged more readily here than on many older platforms, since OpenAI's anti-abuse tooling was built against the current generation of bulk-signup scripts.
A number that already verified an OpenAI account elsewhere won't verify a second one — the platform enforces the one-number-per-account link strictly.
Where to buy a number for OpenAI (ChatGPT)
Availability and price both move with supply in each market. These pools tend to suit this service.
Frequently asked questions
Why does ChatGPT ask for a phone number now?
Phone verification gates both new ChatGPT account creation and the higher usage limits tied to API access, and OpenAI tightened this significantly through 2026 as signup abuse and bulk-account creation increased. A verified, reachable number is now a standard part of both the consumer and developer signup paths, not an optional extra.
Can I use one number for multiple OpenAI accounts?
Generally, no. OpenAI typically binds a verified number to a specific account or organization rather than letting it verify a second one afterward. If you need separate accounts for separate projects or clients, plan on a separate number for each rather than expecting to reuse the same one.
Does OpenAI reject VoIP numbers?
OpenAI's anti-abuse tooling flags VoIP and recently-reassigned numbers more readily than many older, more established platforms, since it was built specifically against the current generation of bulk-signup and account-resale scripts. A real cellular number without a prior OpenAI history is the more reliable starting point.
Is phone verification different for the API versus the ChatGPT app?
Both generally sit behind the same phone-verification gate, and a number that fails on one context typically fails on the other too, since OpenAI ties the verification to the underlying account or organization rather than to which product surface you're using at that moment.
Get a OpenAI (ChatGPT) verification number
Pick a country, get a real cellular number, and receive the code. If it never arrives, the balance returns to your account.