Claude Phone Number Verification Failed? SMS Receiving Platform Solutions

Background

As Anthropic's Claude product line (including developer tools like Claude Code) gains popularity among users in China, more and more people are encountering phone number verification barriers during registration or login. Since Claude currently does not support Chinese mainland phone numbers for SMS verification, many users get stuck at this step and cannot proceed with the service.

Anthropic was founded in 2021 by former OpenAI Research VP Dario Amodei and Daniela Amodei, and is currently one of the world's most influential AI safety companies. The Claude model series is based on their proposed Constitutional AI training method, which allows AI to self-improve according to a set of explicit principles rather than relying entirely on human-annotated feedback. Claude Code is a programming assistant tool designed for developers that can interact directly with code repositories in a terminal environment, performing tasks such as code writing, debugging, and refactoring. It's precisely the powerful capabilities of these products that drive registration demand from Chinese users.

This article introduces a method for solving Claude's phone verification problem through online SMS receiving platforms, helping users who need it to successfully complete the registration process.

Why Claude Registration Encounters Phone Verification Issues

Platform Regional Restrictions

In Claude's registration and login process, phone number verification is a critical step for identity confirmation. Due to compliance and security considerations, Anthropic currently only supports phone numbers from certain countries and regions for receiving verification SMS. Chinese mainland +86 numbers typically cannot pass verification, making it difficult for domestic users to register.

From a deeper perspective, phone number verification is part of the KYC (Know Your Customer) process, a widely adopted identity verification mechanism across global internet services. For AI service providers, phone verification is not only used to prevent bulk registration and abuse but is also related to regulations such as the U.S. Export Administration Regulations (EAR). As a U.S. company, Anthropic must comply with relevant laws regarding service restrictions for users in specific regions, which is the underlying reason why phone numbers from certain countries cannot pass verification.

Common Trigger Scenarios

• Phone verification required when registering a new Claude account
• Security verification triggered when logging into an existing account
• Additional verification needed when using new products like Claude Code

Solution: Using Online SMS Receiving Platforms to Complete Verification

How It Works

Online SMS receiving platforms provide temporary foreign virtual phone numbers that can receive SMS verification codes from various platforms. Users can complete Claude's verification process without actually owning a foreign phone number.

The core technology behind these platforms is VoIP (Voice over Internet Protocol) and virtual number services. Platforms purchase phone number resources in bulk through partnerships with telecom carriers or virtual operators in various countries, then forward SMS content to users in real-time via API. Numbers are typically divided into two types: one-time numbers and long-term rental numbers — one-time numbers are low-cost but cannot be reused, while long-term numbers are suitable for scenarios requiring continuous message reception. The SMS delivery rate of mainstream receiving platforms is typically between 85%-95%, though numbers for some popular services may experience lower success rates due to detection by the target platform's risk control systems.

Step-by-Step Instructions

Step 1: Set Up an Account on the SMS Receiving Platform

Open a dedicated online SMS receiving service website, register, and log in. Some platforms use a card-key system, requiring you to purchase top-up card keys in advance.

Step 2: Select the Claude Verification Service Line

After logging in, find the verification service corresponding to Claude on the platform. Generally, selecting the default Line 1 will meet your needs.

Step 3: Obtain a Temporary Phone Number

Click the "Get Phone Number" button, and the platform will assign an available foreign phone number. Copy this number for later use.

Step 4: Submit the Number on Claude's Verification Page

Paste the obtained phone number into Claude's verification page (no need to manually select a country — the system will automatically identify the number's region), then click to send the verification code.

Step 5: Receive and Enter the Verification Code

Return to the SMS receiving platform and wait for the verification code to arrive, which typically takes a few seconds to a few dozen seconds. Copy the verification code and paste it into Claude's verification input field to complete the verification.

The entire process can usually be completed within one minute.

Precautions and Risk Warnings

Account Security Considerations

• Account Recovery Risk: Registering with a temporary phone number means you may encounter difficulties if you later need to recover your account via phone number. It's recommended to also bind an email address as a backup recovery method.
• Privacy Concerns: Numbers on SMS receiving platforms are shared, meaning theoretically others could also see messages sent to that number. However, verification codes typically have a time limit (usually 5-10 minutes), making the risk relatively manageable. It's worth noting that SMS verification codes use a one-time password (OTP) mechanism and become invalid after expiration, so the window for someone else to intercept and use them is very short.

Compliance Notes

• Using SMS receiving services is not illegal in itself, but you should be mindful of complying with the relevant platform's terms of service
• Anthropic may conduct additional reviews on accounts registered with virtual numbers
• It is recommended to use this method only for personal learning and research purposes

Practical Recommendations

1. Choose reputable SMS receiving platforms to avoid information leaks
2. Complete your account security settings as soon as possible after successful registration
3. If possible, using a real overseas phone number is a more reliable choice
4. Retain access to the email used during registration as the primary means of account recovery

Conclusion

Phone number verification is a common obstacle for Chinese users in Claude's registration process, but it can be resolved relatively conveniently through online SMS receiving platforms. The entire operation is simple and quick, suitable for users who urgently need to use Claude's services. However, in the long run, keeping an eye on whether Anthropic will officially open phone number support for more regions or provide alternative verification methods is the more fundamental solution.