Telesign

Telesign provides digital identity and communications security services that help businesses verify users, prevent fraud, and protect customer accounts. Its core offerings include phone number verification, SMS and voice one-time passcodes, two-factor authentication, and risk scoring based on phone number intelligence and behavioral data. The company serves enterprises across industries such as e-commerce, banking, social media, and telecommunications that need to authenticate users and combat account takeover, fake account creation, and SMS toll fraud. Telesign's APIs integrate into customer sign-up, login, and transaction flows to assess risk in real time and trigger appropriate verification challenges. The company also offers messaging APIs (SMS and WhatsApp) that allow businesses to send transactional notifications, alerts, and marketing communications to customers globally.