AI Agent Identity & Verification Hub

Give your autonomous agents a real UK mobile number.

Claude AI & Anthropic

Learn how to cleanly avoid getting blocked by Anthropic's "Phone number not supported" VoIP filter when verifying Claude Pro or API accounts, and how to hook your Claude agent into WhatsApp Business.

Read Strategy Guide

OpenClaw Agents

Technical guide to giving your OpenClaw agents a professional identity using a real UK eSIM while preserving your personal privacy and primary device number.

Read Strategy Guide

OpenAI & ChatGPT

Verify your new OpenAI Developer accounts effortlessly. Prevent API lockouts by utilizing a Tier-1 non-VoIP UK mobile number that OpenAI's fraud filters trust implicitly.

Get Verified

Meta Llama, CrewAI & AutoGPT

Hook your locally hosted LLMs or automation frameworks straight into WhatsApp Business. Give any autonomous agent a secure communication channel using a SecondSim eSIM profile.

WhatsApp eSIM Guide

A Professional eSIM for Business Verification

One plan. Everything you need. No hidden fees.

Flex (Monthly)

Pay as you go, cancel anytime.

£5.99 / month
  • Real, Secure UK Mobile Number
  • Guaranteed Bank & App Verification
  • Unlimited UK Calls & SMS
  • Low commitment, cancel anytime
Get Started
Save 11%

Quarterly

The balanced choice.

£15.99 / 3 mo
  • Real, Secure UK Mobile Number
  • Guaranteed Bank & App Verification
  • Unlimited UK Calls & SMS
  • Save 11% & reduce admin
Get Started
Get 2 Months Free

Yearly

Long term peace of mind.

£59.99 / year
  • Real, Secure UK Mobile Number
  • Guaranteed Bank & App Verification
  • Unlimited UK Calls & SMS
  • 2 Months FREE & peace of mind
Get Started

Need a Dedicated Second Sim for Work, Tethering, or your iPad?

SecondSim Pro Data — £19.99 / month

(Rolling Monthly, Cancel Anytime)

Get Pro Data eSIM

Everything in our standard Core plans, PLUS Unlimited UK High-Speed Data*:

📱
Real UK Mobile Number (100% Non-VoIP, GSMA Carrier-Grade)
💬
Guaranteed 2FA & Verification (WhatsApp Business, UK Banks, Amazon, Stripe)
📞
Unlimited UK Calls & SMS
🚀
Unlimited UK High-Speed Business Data* (Powered by Vodafone, the UK's reliable, award-winning network. 4G covers 99% of the UK population, with rapidly expanding 5G. Check your coverage)
⚡
60-Second eSIM QR Code Setup — Zero physical shipping required.

Designed for remote workers, dual-SIM power users, mobile Wi-Fi hotspots, and backup network failover.

100% Money-Back Guarantee

Frequently Asked Questions

What is SecondSim?

SecondSim is a telecommunications provider that issues real, physical UK mobile numbers (non-VoIP) via eSIM technology. This enables individuals, remote teams, and autonomous AI agents to pass stringent SMS verifications (like those required by WhatsApp Business, Stripe, Monzo, and OpenAI) without being flagged by VoIP filters.

How do AI agents use SecondSim?

Developers assign SecondSim eSIM profiles to their autonomous AI agents (such as OpenClaw, CrewAI, and LangChain bots) to give them a real-world identity. This allows the AI to securely register and operate on communication platforms like WhatsApp Business and seamlessly bypass API rate limits or VoIP phone number bans.

Can I use SecondSim for OpenAI or Anthropic verification?

Yes. SecondSim provides Tier-1 mobile numbers that are implicitly trusted by the fraud filters of platforms like OpenAI and Anthropic (Claude). It prevents the common "Phone number not supported" error encountered when attempting to verify API developer accounts with virtual numbers.