Apple's iOS is now on 43% of phones, while Android is the operating system of choice for some 47% of users, according to recent smartphone market analysis from NPD Data. This represents a significant turnaround from the previous quarter where the figures were 25% and 60%, respectively. What these figures also indicate is that there has been a small but significant swing away from other operating systems, which slipped from 15% last quarter down to 10% this quarter. RIM is floundering, at around 6%, compared with 21% in Q3 of 2010. Other operating systems, Microsoft’s Windows Mobile and Windows Phone 7 make up the remainder. NPD Data described the situation as a two-horse race and as far as operating systems go, that is very much the case. But when the numbers are broken down into handsets, the iPhone is, by far, the smartphone of choice. The iPhone 4S, iPhone 4, and iPhone 3GS are the top three in terms of sales – so in that regard Apple has a massive lead.