Apple could sell as many as 10 million iPhones by the end of September alone, according to Gene Munster, an analyst at Piper Jaffray, reports Bloomberg. By contrast, it took Samsung about 50 days to sell 10 million of its flagship Galaxy S III smartphone. Analysts at JP Morgan have separately estimated that the new iPhone – due to be unveiled tomorrow – could contribute as much as a half a percentage point to US economic growth in Q4.