As you probably already know, Samsung Galaxy S4 quickly became the fastest-selling Android phone in history when Samsung announced that channel sales had reached 10 million units in under one month.
While it can't move at that speed forever, RBC Capital Markets analyst Mark Sue predicts sales will hit 80 million units this year.
"Galaxy S-4 demand in the first month of availability has been incrementally better than our estimate of 10M units. In comparison, the S-III took nearly 2 months (50 days) to achieve the 10M units mark. Our broad-based channel checks at U.S. stores indicate that demand for the 16G S-4 devices remains strong with 32G Black devices mostly sold-out and 32G White devices yet to make it to the stores.
"At this pace, the GS-4 is likely to cross 20M shipments in 2Q13, potentially reaching 80M S-4 unit shipments in CY13. We expect the new version of Samsung's Note (III) to hit retail shelves in September. We expect Apple to have an updated multi-device smartphone portfolio [sic] with the iPhone 5S, iPhone 5 and iPhone mini this year."
Mark Sue also see global smartphone shipments growing 26% to 870 million units in 2013, and then growing a further 20% in 2014 to just over 1 billion units.