iOS users can now protect themselves against loss of their Threema ID, contacts, group memberships, and privacy settings: Threema Safe, the anonymous backup solution for your most important Threema data, is now also available on iOS.
Since Threema Safe is platform-independent, it allows to transfer the mentioned data from Android to iOS (and vice versa). Threema for Windows Phone will add Threema Safe support with an upcoming update.
To learn more about Threema Safe, please refer to the FAQs. For more details about Threema 4.1 for iOS, please consult the change log.