When dealing with .ipa files from unofficial sources, always ensure you are using a trusted sideloading method. Handling contact data involves sensitive personal information, so verify the app's permissions once installed. If you'd like, I can help you with: Sideloading instructions for iOS 14+ Alternative official apps for contact management
: Keeping a "hidden" local backup on the device that isn't synced to a cloud service for extra privacy. When dealing with
: Designed to move contacts between devices, often generating a .vcf (vCard) or .csv file that can be sent via email, cloud storage, or messaging apps. or messaging apps.