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ChatGPT Phone Verification Rules Overhauled: Why Can't You Change the Bound Phone Number? 2026 Codex and API Verification Avoidance Guide
In 2026, OpenAI fully tightened its ChatGPT phone verification mechanism: not only are desktop Codex and first-time API Key generation forced to verify phone numbers, but the official policy also explicitly states that 'changing the bound phone number is not supported,' and a single number can verify at most 3 accounts. This article breaks down the latest rules and provides secure verification strategies to avoid 'dead account lockout.'
Why VoIP Virtual Numbers Can't Register for ChatGPT: Platforms Check Line Type Before Sending Codes
OpenAI queries the phone number's line type before sending a verification code, and VoIP, Google Voice, and landline numbers are blocked outright, so resending or changing networks won't help. This article explains the detection mechanism, which numbers can pass (real carrier numbers with a Mobile line type), and how to decide between short-term and long-term numbers before switching.
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.
