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Which Country's Phone Number Should You Use for OpenAI Registration? Supported Countries, Number Types, and Verification Timing
OpenAI standard registration no longer requires mandatory phone verification, but verification is still needed when creating the first API key on the API platform, triggering security risk controls, or logging into certain clients. You must use a real mobile number from an officially supported country (such as the US, UK, Japan, etc.). Mainland China, Hong Kong, Russia numbers, and VoIP virtual numbers like Google Voice are strictly prohibited. A single number can be used for API verification on at most 3 accounts.
ChatGPT/Codex Suddenly Requires Phone Verification: Why Chinese Numbers and VoIP Are Rejected, and How to Switch Numbers
When ChatGPT or Codex suddenly prompts for phone verification, it's usually blocked at two points: +86 isn't in OpenAI's supported regions, and VoIP numbers like Google Voice are detected and rejected. This article helps you identify the root cause based on the error, choose between short-term and long-term real mobile numbers, and walk through the correct steps for obtaining and using the number.
Stuck at Codex Login Verification? Try Using a SMS Receive Platform
Many developers face forced phone verification when logging into the Codex desktop client; using a reliable SMS receive platform for overseas temporary numbers can quickly bypass this step.
Codex Login Phone Verification: A Practical Guide Using SMS Reception Platforms
A step-by-step guide on using SMS reception platforms like NexSMS to bypass Codex login phone verification triggered by OpenAI's tightened security.
2026 Latest Codex Phone Verification Guide: How to Solve ChatGPT Phone Verification in China
A comprehensive guide for Chinese users to bypass OpenAI's phone verification for Codex, covering methods using overseas SIM cards and SMS reception platforms like NexSMS.
