No Phone Number is a focused resource for related products, services, and industry information, combining service providers and product options with practical context for evaluating capabilities, costs, and fit.
Threema is a Swiss end-to-end encrypted messenger that lets you register anonymously without a phone number. The app is a one-time purchase of about CHF 3.99, has an open source client audited by ETH Zurich, and is the secure messaging choice for privacy-focused users and enterprises.
Session is a decentralized end-to-end encrypted messaging app that lets you register anonymously with a 66-character Session ID and routes messages through 1000+ service nodes, a leading tool for privacy and anonymous communication.
