Avatar Phone was an iPhone app that was discontinued on April 22nd, 2016. Despite claims from many users, the app was then removed from the App Store and is no longer available for download. By going to Narikiroid's website, the company claims the app has been terminated and kindly asks you remove the application off of your phone. No other information has been found since.
On 07/07/2021, the app was updated by the apple store. The update reads:
The app has been updated by Apple to use the latest Apple signing certificate. Bug fixes
After this update, the loading screen no longer appears when opening the app, and the screen will simply stay blue when trying to load the app. Before this, trying to load the app would take you to the loading screen, which would fail to load.