Anthropic & Claude AI Verification

Verify Claude AI & Pro.
Zero VoIP Blocks.

Anthropic rejects virtual VoIP numbers during Claude Pro account setup and developer API verification. SecondSim delivers a genuine UK mobile network identity on Vodafone so you can pass SMS verification instantly.

Get Claude eSIM (£5.99/mo) How It Works ↓
Carrier-grade network • Runs on Vodafone • 4,000+ UK businesses • No ID checks • Live in 60 seconds
Step-by-Step Architecture

Passing Anthropic's Carrier Security.

Why SecondSim succeeds where Google Voice, Twilio, and burner apps fail.

STEP 01

Instant eSIM Provisioning

Receive your digital QR code within 60 seconds of checkout. Scan it directly on your iPhone or Android device. No plastic SIM required, no postal delays.

STEP 02

Satisfy Carrier HLR Check

When Anthropic sends an SMS challenge, its fraud system inspects the Home Location Register (HLR). SecondSim responds as an authentic Vodafone UK mobile SIM (MNC native), delivering the OTP code instantly.

STEP 03

WhatsApp Business Bridge

Register your new number on the WhatsApp Business app to create an isolated conversational channel. Hook Claude API webhooks or CrewAI agents directly to your customers.

Universal Framework Support

One Line for Your Entire AI Stack.

Whether you are verifying developer API accounts or deploying multi-agent autonomous teams, SecondSim mobile identities are 100% compatible across the ecosystem:

Claude 3.5 Sonnet / Opus
Anthropic API Console
OpenClaw Framework
CrewAI Autonomous Bots
LangChain & LangGraph
Meta Llama 3 API
Devin (Cognition)
OpenAI / ChatGPT
Simple Pricing

Get Your Claude eSIM Profile.

Instant delivery. Rolling 30 days. No minimum contract.

Monthly Plan

Flex Line

£5.99/mo
inc. VAT • Rolling 30 days • Zero contract
  • Real UK 07 Mobile Number (Non-VoIP)
  • Anthropic & Claude 2FA with a Real UK Mobile Number
  • Unlimited UK Incoming/Outgoing Calls
  • Unlimited UK SMS Messages
  • Instant eSIM — Live in 60s
Choose Flex
RECOMMENDED
Annual Saver

Annual Line

£59.99/yr
Save 17% vs monthly • £5.00/mo equiv
  • Everything in Flex Line
  • 2 Months Free vs Monthly
  • Anthropic & Claude 2FA with a Real UK Mobile Number
  • Free PAC Number Porting
  • Priority Developer Support
Choose Annual
Data Intensive

Pro Unlimited Data

£19.99/mo
inc. VAT • High volume autonomous agents
  • Unlimited UK High-Speed 5G Data
  • Unlimited UK Calls & SMS
  • Full 5G Mobile Hotspot & Tethering
  • No Speed Throttling
  • Failover for Remote Server Clusters
Choose Unlimited
100% money-back guarantee If your number does not verify Claude Pro or API within 7 days, receive an immediate full refund.

People who finally switched off

"Running a salon meant clients contacting me 24/7. There's no more evening anxiety when my phone buzzes."
Caroline — The Basement, Urmston
"I've framed it to clients as a priority hotline. Nothing gets lost, and I get my evenings back."
That Girl Friday — business support
"I juggle a job and two side-gigs without carrying a second phone or signing a contract."
Mike — The Braai Guys
Network Benchmark

SecondSim vs VoIP & Burner SIMs.

Comparison for developers building AI agents and verifying platform developer accounts.

Metric SecondSim Virtual VoIP Apps Supermarket PAYG SIMs
Claude Pro / API Verification ✓ 100% Guaranteed ✕ "Number not supported" ✓ Supported
HLR Protocol Verification ✓ Tier-1 Mobile Network Code ✕ Software VoIP flag ✓ Physical MNO
WhatsApp Business Compatibility ✓ Guaranteed Native Account ✕ High suspension risk ✓ Supported
Activation Speed ✓ 60 seconds • Digital eSIM Instant (unusable) 2–3 postal days
Number Retention ✓ Permanent • Active line ✕ Lost if unrenewed Requires regular top-ups
Claude Questions

Frequently Asked Questions.

Anthropic checks phone numbers against authoritative Home Location Register (HLR) carrier databases. Virtual numbers from VoIP providers lack a valid Mobile Network Code (MNC) and are classified as high risk for automated abuse, triggering the "Phone number not supported" error. SecondSim provides genuine UK mobile routing on Vodafone, satisfying these carrier requirements.
Yes. SecondSim numbers are standard UK 07 mobile lines. They receive SMS verification codes from both the consumer Claude portal (Claude Pro) and Anthropic's developer console for API key activation.
By installing your SecondSim eSIM, you can register a standalone WhatsApp Business profile on your mobile phone or companion device. You can then link this dedicated number to automation platforms (such as Make, n8n, or custom Claude API endpoints) without exposing your personal phone number.
We back every line with a 100% money-back guarantee. If you are unable to verify Claude or Anthropic within 7 days, simply email support for an immediate full refund.
Built for Claude Developers

Get your Claude eSIM profile in 60 seconds.

Clean UK 07 carrier mobile line on Vodafone. Designed for Claude Pro and Anthropic API.

Get your eSIM (£5.99/mo) View all AI hubs