How to upgrade an original iphone of current IOS?

I can't understand how to upgrade the IOS of the my sons original iphone. It has an IOS 4.21 and I need to update the IOS to use Whatsapp. Can someone guide me through the process, step by step please?

iOS 4.2.1 was the last version which could be run on an iPhone 3G. Which is not an original iPhone.

The first iPhone, iPhone 1 might not be updated past version 3.1.3

But without knowing exactly which iPhone you talk it is hard to say what it can be updated.

If it's any iPhone before the 4S, (1, 3 G, 3Gs, 4) then it cannot be updated to the latest version of iOS.

Tags: iPhone

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