This indicates a "vault" app . These apps are marketed to hide private photos behind a fake interface, in this case, a contacts list or telephone directory.

This inquiry appears to be about a specifically named, likely malicious or unofficial iOS application package file (

): An iOS App Store Package file. This is the format used to install apps on iPhones and iPads.

Put photos in the Notes app and lock the note with a password.

A "secret photo" app is a prime target for spyware. It may transmit your "hidden" photos and contact list to a remote server.

It is highly recommended to avoid downloading download-secret-photo-telefonbuch-ipa or similar unverified files to protect your personal information and device integrity.

Use well-reviewed, legitimate vault apps from the App Store that have privacy policies.

Files found on third-party sites can be infected with malware designed to steal personal data, spy on user activity, or lock the device (ransomware).