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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.
Google says 'This phone number cannot be used for verification'? Distinguish the cause before changing numbers
A practical guide to diagnosing and resolving Google's 'This phone number cannot be used for verification' error by categorizing root causes and offering a systematic troubleshooting sequence.
NVIDIA Developer Stuck at Phone Verification? Use SMS Receive Service to Get API
NVIDIA build platform phone verification issues in mid-July 2026 caused developers to use professional SMS receive services to bypass gateway failures and obtain NIM API keys.
Stuck at Phone Verification for Claude Registration? How to Use Virtual Numbers to Complete Activation
A guide to bypass Claude's phone verification block with non-VoIP virtual numbers from physical SIM cards for successful registration.
