Figures from Fiksu, however, have branded those accumulated over the handset's opening weekend as "unprecedented", with the firm's index a measure of the average aggregate daily downloads of the top free iPhone apps in the US claiming downloads jumped 70 percent.
Post-launch, download rates also held up, settling at an average figure of 54 percent for the rest of October.
Big spenders
These figures are based on those accumulated during October before iPhone 4S rolled out, suggesting the rise could be inflated somewhat.
However, Fiksu claims the surge represented a "great opportunity" for mobile advertisers providing they had the money to spend to attract the new consumers, of course.
"As predicted, October was a frenzied month," said CEO Micah Adler.
"For mobile marketers seeking a window of extreme growth regardless of cost, the iPhone 4S launch presented a bonanza to secure large volumes of new users.
"But for those seeking to maximise value and ROI, the best bet was to resist the temptation to join the initial rush."
Fiksu estimated that its custom metric - the cost per loyal app user - dropped 12 percent to $1.47 in October from Septembers all-time high of $1.64 due to the large increase in app downloads.
The real story
In all, daily download rates of the top 200 free apps hit 4.91 million in October, up 29 percent from 3.80 million in September.
However, thanks to millions re-downloading apps they already owned on previous iOS devices, Fiksu estimates the likely net volume was 4.5 million apps downloaded per day.
"Our advice to cost conscious marketers was to wait it out for a week and then take advantage of the efficiencies in heightened volumes at significantly lower costs," concluded Adler.
Fiksu's full analysis can be found on the firm's website.
