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Say Goodbye to Verification Stuck! 2026 Latest Codex Phone Number Verification Tutorial: Step-by-Step Guide to SMS Verification in China and Bypassing OpenAI Risk Control

5/5/2026 Codex phone number verification tutorialOpenAI SMS verificationChina phone number verificationBypass OpenAI risk controlChatGPT Plus upgradeAPI Key generation errorHero-SMS anti-pitfall guide

Recently, many developers have been searching for Codex phone number verification tutorials. Because OpenAI has strengthened its risk control, many users suddenly get stuck at the phone number verification step when using ChatGPT Codex, Codex CLI, or obtaining an OpenAI API Key.

This article will give you an in-depth analysis of why Codex triggers phone number verification, and provide a detailed SMS verification solution tailored to users in China, helping you quickly bypass the verification restriction.

# 📑 Table of Contents (click to jump)

1. Why Does Codex Require Phone Number Verification Recently?

Your regular ChatGPT account can log in normally, so why does calling Codex or generating an API still require phone number verification?

Core reason: The official store is cracking down on abuse and tightening account risk control across the board.

In recent months, a large number of relay/resale stations have used registration bots (especially Outlook mailboxes) to register free accounts in bulk and maliciously harvest the official Codex free quota. This bulk calling heavily consumes official compute, causing free users' quota to be limited.

To deal with this abuse and the flood of cheap Plus accounts on the market, OpenAI has enabled mandatory phone number verification for accounts with abnormal login IPs or risky runtime environments. Newly registered free users have a very high probability of being hit with verification.

💡 Way out: For ChatGPT Plus / Pro subscribers, the probability of triggering verification drops significantly. If you want to skip the tedious verification and use premium services directly, you can use a stable GPT upgrade/top-up entry point in China: 👉 https://gptplus.org.cn (opens new window).

Codex verification blocked diagram

2. Can a China Phone Number (+86) Verify Codex / OpenAI?

The short answer is: basically no. OpenAI's services are not directly available in mainland China, so you cannot select a phone number starting with +86.

If users in China force it, they usually run into the following risk-control problems:

  • No SMS verification code is received at all.
  • The system directly says the number is not supported (Unsupported country).
  • It says sending too frequently, and the account is restricted by the system.
  • The current network doesn't match the account's registration region, triggering deep risk control.
  • The number has been abused by many people, and it says the verification limit has been reached.

This is why users in China must rely on real overseas phone numbers or third-party SMS verification platforms to bypass the restriction.

3. How to Solve Codex Phone Number Verification? (with Detailed Tutorial)

Based on security and cost of operation, here are the two most efficient solutions.

# Method 1: Prioritize using your own real overseas phone number (most stable)

If you or a relative/friend has an overseas physical SIM card (such as in the US, UK, Japan, Singapore, etc.), this is the best way to pass verification.

Advantages:

  • Clear account ownership, with extremely low risk of later bans.
  • No conflict from the number being reused by others.
  • If you ever need to recover the account or do secondary security verification later, it's very convenient.

Difficulty: Most regular users in China don't have an overseas physical SIM card, so the barrier to obtaining one is high.

# Method 2: Use an SMS verification platform to temporarily receive codes (most convenient)

If you only need to complete a one-time API Key generation or a single Codex verification, using an SMS verification platform is the most economical choice.

Detailed steps:

  1. Register on an SMS verification platform: Visit and register on a reliable platform, such as Hero-SMS: https://hero-sms.com/cn (opens new window)
  2. Top up a small amount: Recharge a very small balance, enough for a single verification.
  3. Search for the service: Type OpenAI or ChatGPT in the platform's search box.
  4. Choose a country: Pick a country number that supports OpenAI verification with a high success rate.
  5. Fill in the number: Enter the obtained virtual number into OpenAI's verification page.
  6. Receive the SMS: Click to send the verification code, then return to the platform and wait for it.
  7. Complete verification: Fill the received 6-digit code back into the OpenAI page, and you're successfully unlocked.

⚠️ SMS verification anti-pitfall guide:

  • Don't be tempted by extremely cheap numbers; low-price number pools are usually heavily polluted.
  • If you don't receive the verification code within 3 minutes, cancel the order promptly (usually no charge) and switch to a new number to retry.
  • Never spam-click "resend" repeatedly — it's very easy to get your IP blacklisted or account banned by OpenAI.
  • Don't buy "finished black-card numbers" of unknown origin, as there's a high risk of being reclaimed later.

SMS platform interface example

4. Which Country Should You Choose for SMS Verification?

OpenAI's risk-control policies and SMS channels change at any time, so there's no "absolutely always works" country. But in practice, we recommend following these principles to improve your pass rate:

Region selection

  • Avoid popular low-price regions: Regions like Indonesia and Brazil, which have long been abused for cheap numbers, tend to have higher failure rates.
  • Prioritize high-success-rate regions: Watch the "success rate percentage" marked on the SMS platform interface, and prefer countries with a recent success rate above 80% (such as some less popular European or South American countries).
  • Try WhatsApp verification: OpenAI currently allows some countries (such as India, Indonesia, Vietnam, Turkey, Ukraine, etc.) to receive verification codes via WhatsApp. If the verification page shows a WhatsApp option, prefer this channel — its success rate is higher than traditional SMS.

5. Common Errors and Effective Solutions

While following the Codex phone number verification tutorial, you may encounter the following 4 common errors:

# 1. Can't receive the verification code

  • Cause analysis: The virtual number doesn't support OpenAI, the SMS platform channel is congested, or your current network IP is identified as a high-risk environment.
  • Solution: Decisively switch to a number from a different country on the SMS platform; or switch to a cleaner proxy, wait 5 minutes, and try again.

# 2. It says the phone number is already used

  • Cause analysis: OpenAI stipulates that the same phone number can only be bound to a limited number of accounts. Virtual numbers are usually shared, and the number you drew has already reached its binding limit from a previous user.
  • Solution: Cancel the current number order and buy a new number.

# 3. It says the country is not supported (Unsupported country)

  • Cause analysis: Your network proxy's exit IP is in a region blocked by OpenAI (such as a direct connection from China or certain specific countries).
  • Solution: Check your network environment, make sure the global proxy is switched to a fully supported region like the US or Japan, clear your browser cache, and retry.

# 4. Verification passed, but Codex still reports an error (403 / No active subscription)

  • Cause analysis: Phone number verification only solves the permission issue for "account security and creating an API Key", and does not mean you have the Codex compute-calling entitlement.

  • Solution: To use advanced model capabilities, you need to subscribe to ChatGPT Plus / Pro or ensure you have sufficient API balance. If you encounter this error, it means you need to upgrade your account.

6. Summary and Subscription Recommendations

For many developers searching for "Codex phone number verification tutorials", the real underlying problem is the risk-control verification triggered when generating an API Key for the first time on the OpenAI Platform.

Summary of strategies:

  1. If you have an overseas physical phone number, verifying directly is the most reliable.
  2. If you only need a one-time verification, using a reliable SMS platform is enough.
  3. If you don't want to deal with the network and SMS verification hassle, we recommend going through a legitimate top-up upgrade solution.

Finally, it's important to emphasize: completing phone number verification ≠ having a Codex subscription entitlement. If you're still on a free account, even a successful verification may not let you call advanced interfaces. If you want to skip the tedious steps and quickly open a stable ChatGPT Plus subscription, go directly to the channel below:

🚀 Go straight to the Codex / ChatGPT Plus self-service upgrade entry (opens new window)