The first day saw iOS 7 levels jump to 18.2%. By the second day they were at 31.7% and seven days after launch they reached 51.8%.
One week following the start of the public rollout on September 18th, adoption of iOS 7 in North America reached levels close to 52%. This bests the impressive adoption rate of iOS 6 in the same time period last year.
Take a look at the charts below for more details...