April 28, 2025|8 min reading
Fix Claude AI "Error sending code. Double check your phone number." Easily

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Are you trying to register for a Claude AI account but getting stuck on the phone number verification step with an "Error sending code. Double check your phone number" message? You're not alone! This is a common hurdle for many potential users.
Claude AI, developed by Anthropic, is a highly capable conversational AI gaining significant popularity. Its advanced language understanding and context handling make it a powerful tool for various tasks, from creative writing to coding assistance. However, accessing this impressive AI shouldn't be a frustrating experience.
This article dives into why you might encounter this specific phone number verification error and provides practical, step-by-step workarounds to help you fix it and successfully register for Claude AI. We'll also explore an alternative way to access Claude instantly through the Merlio platform.
Understanding the "Error sending code" in Claude AI
The "Error sending code. Double check your phone number." message typically appears during the account registration process when Claude AI attempts to send a verification code (usually via SMS) to the phone number you've provided. If the code fails to send or be recognized, this error is triggered.
What Causes This Verification Issue?
Several factors can contribute to this specific error:
- Incorrect Phone Number or Country Code: The most straightforward cause. A simple typo in the number or selecting the wrong country code will prevent the SMS from reaching you.
- Unsupported Region: Claude AI's availability is currently limited to specific countries (primarily the US and UK for direct registration). Using a phone number from an unsupported region is a common reason for verification failure.
- VPN or Proxy Issues: Using a VPN or proxy server during registration might conflict with Claude's location checks, leading to the error.
- Network or Carrier Problems: Occasionally, the issue might be with your mobile carrier or network's ability to receive the verification SMS.
- Using VoIP Numbers: Phone numbers from VoIP services (like Google Voice) are often not supported and may be flagged, leading to registration issues or even account bans later.
- Temporary Glitches: Like any online service, Claude's verification system can experience temporary technical hiccups.
Workarounds for the Phone Number Verification Error
If you're facing the "Error sending code" message, try these steps:
Double-Check Your Details
- Verify the Phone Number: Carefully re-enter your entire phone number, digit by digit.
- Confirm the Country Code: Ensure you have selected the correct country code for the phone number you are using. This is a frequent oversight.
Address Location-Based Issues
- Disable VPN/Proxy: If you are using a VPN or proxy, try disabling it temporarily and attempt registration again. Ensure your IP address aligns with the country of your phone number if possible.
- Check Supported Countries: Confirm that direct Claude AI registration is available in your country. If not, you may need to explore alternative access methods discussed below.
Troubleshoot Your Connection and Device
- Check Network Signal: Ensure your phone has a strong mobile network signal capable of receiving SMS messages.
- Try Different Device/Browser: Attempt the registration process on a different device (e.g., desktop vs. mobile) or in a different web browser. Clear your browser's cache and cookies before trying again.
- Restart Your Phone: A simple restart of your mobile device can sometimes resolve underlying communication issues.
Consider Alternative Sign-Up Methods
- Use "Continue with Google": If available, try initiating the sign-up process by linking your Google account first, then entering your phone number carefully when prompted later in the process.
Accessing Claude AI Instantly with Merlio
If direct registration remains challenging due to the phone number error, or if Claude AI isn't directly available in your region, the Merlio platform offers a fantastic alternative for accessing Claude models instantly.
Merlio is designed to make powerful AI accessible to everyone, providing a unified platform to interact with various leading AI models, including different versions of Claude (like Claude-3-Opus, Claude-3-Sonnet, Claude-2.1, etc.). You can leverage Claude's capabilities through Merlio without needing to go through the direct registration and phone verification process with Anthropic.
How to Use Claude AI via Merlio:
Visit the Merlio website and sign up or log in to your account.
Navigate to the platform's "App Store" or "Models" section.
Find the Claude AI model you wish to use among the available options.
Select the Claude model and start interacting directly within the Merlio interface.
Using Merlio provides a seamless way to experience Claude's advanced features without the potential frustration of registration errors. Merlio also offers the flexibility to explore other AI models and build custom AI applications or automate workflows, all within a user-friendly environment.
Conclusion
Encountering the "Error sending code. Double check your phone number." during Claude AI registration can be frustrating, but it's often resolvable. By carefully verifying your phone number and country code, addressing potential location or network issues, and trying simple troubleshooting steps like clearing cache or using a different device, you can often overcome this obstacle.
However, if direct registration proves persistently difficult, remember that platforms like Merlio provide a convenient and reliable alternative for accessing Claude AI immediately, bypassing the need for direct phone verification with Anthropic.
Approaching the process with patience and trying these suggested workarounds should help you get past the error and start utilizing the powerful capabilities of Claude AI, either directly or through accessible platforms like Merlio.
SEO FAQ
Q: Why does Claude AI require phone number verification? A: Phone number verification is a common security measure used by online services to verify the identity of users, prevent abuse, and limit the creation of multiple accounts.
Q: Can I use a virtual phone number (VoIP) for Claude AI registration? A: Generally, no. Claude AI and many other services often do not support VoIP numbers like those from Google Voice, and attempting to use them can lead to verification errors or account issues.
Q: The error persists even after trying all workarounds. What else can I do? A: If you've exhausted the troubleshooting steps and verified your details are correct, the issue might be temporary on Claude's end or indicate an unsupported number type/region. Consider using a platform like Merlio to access Claude without direct registration.
Q: Is Merlio a free alternative to Claude AI? A: Merlio offers access to various AI models, including Claude. Pricing depends on the Merlio plan and usage, but it provides a way to use Claude when direct access is problematic, often with free tiers or trials available to get started.
Q: Does Merlio offer access to the latest Claude models like Claude 3? A: Yes, platforms like Merlio typically integrate access to popular and recent AI models, including different versions of Claude 3, allowing users to utilize their advanced capabilities.
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