Nielsen now takes a look at its own data, showing similar momentum that had carried over through the end of 2011.
Among recent acquirers, meaning those who said they got a new device within the past three months, 44.5 percent of those surveyed in December said they chose an iPhone, compared to just 25.1 percent in October. Furthermore, 57 percent of new iPhone owners surveyed in December said they got an iPhone 4S.Breaking the data down into monthly surveys of people who had acquired a new smartphone over the previous three months, that iPhone 4S effect resulted in iOS nearly matching Android in share of recent smartphone acquirers as of December.
Given the three-month windows of time covered by each monthly survey, December's data would include at least several weeks of time prior to the iPhone 4S launch. Data for January could thus show even stronger performance by Apple, although some of the early iPhone 4S adopters may fall out of the January sample due to the three-month window having closed, depending on when during the month the data is collected.