NumberThin Network - a telephone book that will never be lost

Personal address books provide users with personal accounts free of charge, and guarantee the uniqueness of user registration and login and confidentiality of personal data with personal mobile phone numbers as the username. Personal address books can automatically record received business card information. Meanwhile, personal data can be sent to others through business cards in the personal address book. The group function of the system enables relevant friends to share data and communicate conveniently.