Downloading ios 4.3 and viber?

Ok, so my dad wants to install viber to his iphone 4.
but it says that he needs that ios 4, 3 thing on order to do so
so it usually takes us about 40 mins to download that thing
so my question is help me
i have a samsung galaxy ace plus and i had no problem installing it i just added google account on my phone and got it and it works fine
i'm not apple things fan but i really want to make this work haha so help me.

This is an official representative of Viber Media.

Viber temporarily supports only iOS 4.3 and above. We're working to fix this issue As soon as possible. Please stay tuned!

For more questions or technical support, please visit our official HelpDesk.

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