However, in 2016, Rakuten announced that it would discontinue Viber's desktop and mobile apps, replacing them with a new messaging service called Rakuten Chat.
In conclusion, the Viber .ipa file for iOS 4.2.1 represents a significant milestone in the history of messaging and VoIP services on mobile devices. The app's innovative features and popularity paved the way for future messaging services that we use today.
Here's a brief overview: