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If Viber refuses to connect to its authentication servers, you can still use your iOS 4.2.1 device for communication using other vintage platforms: Viber .ipa for ios 4.2.1
Viber does not officially support legacy firmware like iOS 4.2.1. The official App Store will generally only offer the "last compatible version" if you have previously "purchased" (downloaded) Viber on your Apple ID. This public link is valid for 7 days
If Viber opens but fails to send the SMS activation code, the application is attempting to reach an obsolete server endpoint. For functional messaging on ultra-legacy devices, users often migrate to decentralized or open-source protocols (like IRC or local XMPP clients) designed for retro hardware, rather than closed mainstream networks. To help tailor further instructions, tell me: What are you using? Is your device already jailbroken ? Can’t copy the link right now
Open iFunBox or your downgraded version of iTunes.
If you succeed in installing and activating it, you’ll experience a quirky, broken version of Viber — perhaps the last time the app felt truly lightweight. For everyone else, the quest offers valuable lessons in iOS history, sideloading, and the ephemeral nature of cloud-driven software.