OpenAI SMS Verification Numbers

OpenAI no longer asks for a phone number to create a ChatGPT account, but it still requires one on platform.openai.com before it issues your first API key, and it can ask again on later verification or account-change steps. The check runs against carrier data, not just number format: OpenAI states it does not support landlines, VoIP, Google Voice or premium numbers, so those are refused before a code is ever sent. What passes is a real mobile line on a carrier network, which is what the numbers in this catalog are: non-VoIP carrier numbers that receive the OTP the same way a handset would.

Three ways to take the code. A one-time OTP holds a US number for 15 minutes and starts at $0.25 for OpenAI/ChatGPT; if no code arrives in the window the rental cancels and refunds in full, and reusing the same number inside the window costs nothing. A multi-day rental keeps a US number for 3, 7, 14 or 30 days, always active, which covers re-verification, API tier changes and login challenges that land days after signup. A dedicated monthly non-VoIP line is the option offered per country, currently from $16.99 a month, and it stays yours across platforms.

Pick by how long you need to be reachable. If the account is throwaway-adjacent or you only need the initial signup code, a one-time OTP is enough. If the account holds a billing relationship, an API key or a team workspace, treat the number as part of that account's identity and hold it: losing the line means losing the recovery path. Pair either with a stable IP if you sign in from unusual locations, because OpenAI weighs login network and device signals alongside the number.