Session. Messenger without phone number and email.

"Session is a messenger focused on user security and anonymity. It is built on a decentralized network, which helps prevent data leaks and protect metadata. Unlike traditional messengers, you don’t need a phone number or email address to register with Session, making it more private.

Session offers:
Anonymity: no need to provide personal data when registering.
Security: end-to-end encryption of messages and no central server, which minimizes the risk of data leaks.
Availability: can be used in blocking conditions, available in regular app stores."