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Its predecessor, the Samsung Galaxy S III took about 100 days to get to 20 million, so the galaxy S4 is selling 1.7 times faster. This speed reportedly put the Galaxy S4 at the #1 position in shipments for Q2 this year.
Analysts have predicted that the S4 will sell 80 million units this year, beating the 60 million achievement of the Galaxy S III.
There's a souped up version of the Galaxy S4 that came out recently, the Galaxy S4 LTE-A with a Snapdragon 800 chipset and LTE-Advanced connectivity. It's available only in South Korea for now, but we wonder how it will affect sales numbers if it sees a worldwide release.
Source: GSMArena