Anthropic (Claude) asks for your phone number during signup — and handing it over ties your identity to your AI conversations. Whether you're building an AI agent, testing Claude's API, or just want to use the chatbot without sharing your personal number, there's a cleaner option: a virtual phone number that receives the verification code for you.

This guide walks you through the full process in under 5 minutes using a temp number from CodeSender. Cost: from $0.20. No VPN needed.

Why Anthropic Requires Phone Verification

Anthropic uses phone verification to prevent bot accounts, limit abuse of their API credits, and secure user accounts. Claude — their flagship AI assistant — offers both a free web interface and paid API access. The platform asks for a number during new account creation and sometimes for high-volume API access.

Three types of users commonly need a workaround:

Privacy-conscious users — you don't want your AI conversations linked to your real phone number
Developers and businesses — testing multiple Claude API keys or building agentic workflows requires separate numbers for each account
Users in unsupported regions — Anthropic restricts certain countries; a virtual number from a supported country bypasses this

What Is a Virtual Phone Number?

A virtual phone number works exactly like a real SIM number — it receives SMS messages instantly. You get it online, use it for verification, and never tie it to your personal identity.

CodeSender offers two options depending on your needs:

SMS Activation — one-time number for a single verification. From $0.20. Best for creating one Claude account.
Phone Rental (7–30 days) — a real number you keep long-term. Best if you need ongoing access to your Claude account without risking SMS verification again.

What You Need Before Starting

A CodeSender account (free to create)
A small balance — Claude verification starts from $0.20
claude.ai open in your browser, ready for the phone verification step

How to Verify Claude (Anthropic) Without Your Personal Number — Step by Step

Step 1 — Go to Claude phone verification

Open claude.ai and click Sign Up. When Anthropic asks you to enter a phone number — stop and don't enter your real number yet.

Step 2 — Open CodeSender in a new tab

Go to codessender.com/activation/service/claude. This takes you directly to the Claude activation page.

Step 3 — Choose your country

Select a country for your temp number. Best options for Claude verification (Anthropic accepts most countries):

United States — highest acceptance rate, fastest delivery
United Kingdom — reliable option
Canada — strong success rate
Germany — cost-effective choice
Australia — good alternative

If one country doesn't work, release the number and try another — you won't be charged for failed attempts. Unlike Google, Claude rarely rejects numbers.

Step 4 — Purchase your temp number

Click Activate. You'll get a real phone number instantly. Cost starts from $0.20. Copy the number to your clipboard.

Step 5 — Enter the number into Anthropic

Switch back to Claude. Paste your temp number with the correct country code and click Send Verification Code (or equivalent). Anthropic will send an SMS to this number.

Step 6 — Get your SMS code

Switch back to CodeSender and click Get SMS. Your verification code appears within 5–30 seconds. Copy it immediately — codes expire after a few minutes.

Step 7 — Enter the code into Anthropic

Paste the code into Claude's verification screen and click Verify. Your account is now ready to use.

SMS Activation vs Phone Rental — Which to Choose for Claude

Both work for Anthropic verification but serve different needs:

SMS Activation — best for verifying a single Claude account once. Cheaper, faster, done in minutes.
Phone Rental — best if you plan to use Claude API heavily and want a number that stays active for account recovery or future verification prompts. Ideal for developers running production workloads.

If you're not sure, start with SMS Activation. It costs less than $0.50 and handles 99% of cases.

Common Issues and Fixes

"This phone number cannot be used for verification"

The number was previously used on Anthropic. Click Release on CodeSender and activate a fresh number — try a different country. US and UK numbers have the highest success rates.

Code not arriving

Wait 60 seconds. If nothing comes, release the number and get a new one. SMS delivery on CodeSender is typically under 30 seconds. Make sure both tabs are open simultaneously so you can copy the code immediately.

Claude not accepting my country's number

Anthropic restricts signups from certain regions (Russia, China, some others). Choose a number from the United States or United Kingdom — this bypasses geographic blocks completely. You don't need a VPN.

Code expired before you entered it

Anthropic codes expire within a few minutes. Have both tabs open at the same time — click Get SMS and paste the code into Claude immediately when it arrives.

Frequently Asked Questions

Is it legal to use a virtual number for Claude?

Yes. Virtual phone numbers are legitimate tools used by developers, researchers, and privacy-focused users worldwide. Make sure your use of Anthropic's services complies with their Terms of Service.

Will Anthropic accept a temp number?

Yes. Temp numbers from CodeSender are real SIM-based numbers. Unlike some platforms, Anthropic does not aggressively filter out virtual numbers — most work on the first try.

Does Claude (Anthropic) block VoIP numbers?

No — at least not strictly. CodeSender uses real carrier numbers, not VoIP. But even VoIP numbers often work with Claude. Your success rate with CodeSender is near 100%.

How much does it cost?

Claude verification starts from $0.20 for a one-time SMS activation. Phone Rental starts from a few dollars per week depending on the country.

Do I need a VPN for Claude?

No. A virtual number works without a VPN. However, if Anthropic blocks signups from your country, you may still need a VPN in addition to a virtual number. The number handles SMS verification; the VPN handles the IP restriction.

Can I verify multiple Claude accounts?

Yes — each Anthropic account needs a different virtual number. Purchase separate numbers on CodeSender as needed. This is common for developers testing different API keys or building multi-agent systems.

What if verification fails on the first try?

Release the number and get a new one — you won't be charged for numbers that didn't deliver a code. Try a different country if the first one fails. US and UK numbers work best for Anthropic.

Does this work for Claude API as well?

Yes. The same verification process applies whether you're signing up for the free chat interface or a paid API account.

Conclusion

Verifying a Claude (Anthropic) account without your personal phone number takes less than 5 minutes and costs as little as $0.20. You get a real number, receive the SMS code instantly, and Anthropic never gets your personal number.

US and UK numbers work best for Claude. If one fails, switch countries — you only pay for numbers that deliver a code.

Get your Claude verification number now →