By all accounts, the iPhone 5s is selling better than any previous iPhone, and Apple has been able to keep up with demand. According to Fiksu, which tracks iOS usage through its SDK, the iPhone 5s is ramping up faster than the iPhone 5 did a year ago. 68 days after launch, the iPhone 5s accounts for 7.66% of all iPhone usage, which is higher than the 6.28% the iPhone 5 had 68 days after launch a year ago.
This is consistent with other reports that suggest the iPhone 5s is selling better than the iPhone 5 and that Apple is finally catching up with demand. An earlier report suggested that 90% of all iPhone 5s models are now available at Apple stores, which is 0.8% higher than the iPhone 5 a year ago. Then, according to a report on Wednesday from the Wall Street Journal, Foxconn is producing 500,000 iPhone 5s units each day, which is the highest output rate ever for a single smartphone model. In addition, shipping times have dropped from 1 to 2 weeks to 3 to 5 days.