OpenAI may require phone verification when creating your first API key or accessing developer tools such as API services and Codex-related workflows. Depending on your country and risk signals, verification may happen via SMS or WhatsApp OTP.

If you prefer not to use your personal number, temporary real SIM numbers provide a fast and privacy-friendly way to receive OpenAI verification codes online.

In 2026, one of the easiest ways to receive OpenAI SMS or WhatsApp verification codes is using CodesSender. The service provides real SIM-based temporary numbers from 50+ countries with instant OTP delivery and no subscriptions.

OpenAI API and Codex Verification

Phone verification may be required for access to OpenAI developer tools, including API features and Codex-related workflows.

OpenAI Codex is part of the OpenAI developer ecosystem focused on AI coding, automation, and software engineering assistance. Depending on account activity, region, and platform security checks, OpenAI may request verification through SMS or WhatsApp OTP before allowing access to certain developer capabilities.

Because of this, many developers prefer using temporary real SIM numbers instead of personal phone numbers for verification and testing workflows.

Why OpenAI May Require Phone Verification

OpenAI uses phone verification as a security and anti-abuse measure for API access and developer tools.

Depending on your country and risk profile, verification can happen through:

SMS verification
WhatsApp OTP verification

Many developers and privacy-focused users prefer temporary numbers because they:

Do not want to use a personal phone number
Need a separate number for API testing
Want privacy-friendly verification options
Need non-VoIP numbers for stable OTP delivery
Work with OpenAI API or Codex development tools

SMS vs WhatsApp Verification for OpenAI

OpenAI supports WhatsApp verification only in selected countries. In other regions, verification usually happens through SMS OTP.

Verification Method	Availability	Best Number Type
SMS OTP	Global	Real SIM-based mobile numbers
WhatsApp OTP	Selected countries	Mobile numbers with WhatsApp support

⚠️ Important: Many VoIP numbers fail OpenAI verification checks. Real SIM-based numbers usually provide much higher OTP success rates.

Why Developers Use Temporary Numbers for OpenAI and Codex

Privacy protection — avoid exposing personal numbers
Developer workflows — separate coding and testing environments
Fast OTP delivery — receive verification codes instantly
Global access — numbers from 50+ countries
Better compatibility — real SIM numbers perform better than VoIP

What Makes CodesSender Different

CodesSender provides temporary numbers optimized for OTP delivery and online verification services.

Real SIM-based numbers — not disposable VoIP inboxes
50+ countries available
Fast SMS and WhatsApp OTP delivery
Pay per activation — no subscriptions
Privacy-friendly verification
Reliable for API and developer verification flows

Best Countries for OpenAI Verification Numbers (2026)

Based on current pricing and availability, these are some of the most popular countries for OpenAI SMS and WhatsApp verification:

Country	Starting Price	Best For	Action
Colombia	$0.28	Budget OTP verification	GET NUMBER
United Kingdom	$0.40	WhatsApp verification	GET NUMBER
France	$0.76	Stable SMS delivery	GET NUMBER
Romania	$0.80	Affordable EU verification	GET NUMBER
Portugal	$0.80	Fast OTP reception	GET NUMBER
Poland	$1.25	Reliable EU mobile numbers	GET NUMBER
United States	$2.19	Premium trust level	GET NUMBER

How to Receive an OpenAI Verification Code Online

Step 1 — Get a Temporary Number

Visit CodesSender and choose a country for SMS or WhatsApp verification.

Select a real SIM-based temporary number and activate it.

Step 2 — Start OpenAI Verification

Open the OpenAI developer platform and begin the phone verification process.

Enter the temporary number you received from CodesSender.

Step 3 — Receive the OTP Code

Wait for the verification code to arrive.

Depending on your country, the OTP may be delivered through:

SMS
WhatsApp message

The verification code appears directly inside your CodesSender dashboard.

Step 4 — Complete Verification

Enter the OTP code into OpenAI verification and complete setup.

Once verified, you can continue using OpenAI developer tools, APIs, and Codex workflows normally.

Why Real Numbers Matter for OTP Verification

Many online services automatically block low-quality VoIP numbers. This is why users often experience failed OTP delivery with free public SMS websites.

Real SIM-based numbers have better compatibility because they:

Behave like physical mobile carrier numbers
Support stable SMS routing
Work better with WhatsApp OTP systems
Reduce failed verification attempts

💡 Tip: UK, France, Poland, and US numbers generally provide the most stable verification experience for international developer services.

SMS Activation vs Long-Term Number Rental

SMS Activation is ideal for one-time verification codes. You pay once, receive the OTP, and complete verification.

Phone Rental is better if you need long-term access to the same number for future recovery or repeated logins.

Option	Best For	Typical Price
SMS Activation	One-time OTP verification	$0.28 – $2.19
Phone Rental	Long-term access	Weekly or monthly

Frequently Asked Questions

Does OpenAI require phone verification?

OpenAI may require phone verification for API access and developer security checks.

Can I receive OpenAI OTP online?

Yes. Temporary real SIM numbers can receive OpenAI SMS and WhatsApp verification codes online.

What numbers work best for OpenAI verification?

Real SIM-based mobile numbers generally work better than VoIP or public SMS inboxes.

Can I use temporary numbers for OpenAI Codex verification?

Temporary real SIM numbers are commonly used for receiving verification codes for developer platforms and API services. Real mobile numbers generally provide higher OTP delivery success rates than VoIP services.

Can I receive WhatsApp OTP verification?

Yes, but WhatsApp verification is available only in supported countries.

What is the cheapest country for OTP verification?

Based on current pricing, Colombia and UK numbers are among the most affordable options for OTP delivery.

Are temporary numbers legal to use?

Temporary numbers are commonly used for privacy and online verification purposes. Users should always follow the Terms of Service of the platforms they access.

Conclusion

Receiving OpenAI verification codes online is simple with real SIM-based temporary numbers. Whether verification happens through SMS or WhatsApp OTP, reliable non-VoIP numbers significantly improve delivery success rates.

CodesSender provides affordable temporary numbers from 50+ countries with fast OTP delivery, making it easier to complete OpenAI verification securely and privately.

Quick recap:

Works for OpenAI API and Codex-related verification flows
Use real SIM-based numbers instead of VoIP
WhatsApp verification works only in supported countries
SMS activation is ideal for one-time verification
UK, France, Poland, and US numbers offer stable delivery
Affordable OTP numbers start from just $0.28

Get your temporary number for OpenAI verification now →