estos provides the ProCall Enterprise Mobile Apps only as long as the ProCall version is still in its life cycle. After the end of life of a ProCall Enterprise version, the mobile apps are no longer available and can no longer be accessed via the app stores.

In particular, this currently affects the ProCall Mobile App from ProCall 5 Enterprise (End of Life 2019).

To use the mobile app, it is necessary to upgrade the ProCall Enterprise version to a current version.