The SMS Verification Market is Bigger Than Most People Realise: Data from 67,000+ Virtual Phone Numbers

We run Quackr, a virtual phone number platform that lets developers and individuals receive SMS verifications without exposing a real number. We just published our first inventory transparency report and the data was surprising enough that we thought the dev community would find it useful. The Numbers Right now, 97.6% of our entire virtual phone number inventory is actively rented. 66,214 out of 67,815 numbers assigned and in use across 15+ countries. Over 1,000 numbers available at any given moment but they move fast. That utilisation rate tells you something about how the market has shifted. Virtual numbers are no longer a niche throwaway tool. Developers, businesses, and privacy-conscious users are holding them long term. What Developers Actually Use Virtual Numbers For The obvious use case is SMS verification during testing. Spin up a number, verify an account in staging, move on. But that is not what drives the bulk of demand on our platform. The real volume comes from: Multi-account management — developers and businesses running multiple instances of platforms that require unique phone verification per account. Privacy layers in production apps — applications that need to verify users without collecting their real numbers. A virtual number sits between the user and the platform. Automated verification pipelines — this is where our API and MCP Server come in. If you need to provision numbers programmatically and retrieve OTPs without manual intervention, this is the use case we built for. Geographic flexibility — needing a UK number from Australia, a US number from Ukraine, or any combination that your real SIM cannot provide. The OTP Blocking Problem Something worth knowing if you are building anything that involves SMS verification: platform-level VoIP blocking has become significantly more aggressive over the past two years. WhatsApp, Telegram, Google, and TikTok all run detection on incoming verification requests. A VoIP number gets flagged and the OTP simp