The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
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download may not be available in some countries.
From Catrnja Dev:
Backup, merge & restore your contacts in just a few seconds. If you have been looking for an app that helps you backup and restore all your contacts fast and easy, this is the app for you.Features:- Backup your contacts to Dropbox, Google Drive, iCloud- Restore your contacts from Dropbox, Google Drive, iCloud- Portable contacts as they are exported in the popular vCard format- Delete multiple contacts with only few taps on your device- Easily merge two selected contacts within a second- Edit your contacts details with a single tap on your device