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.
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iPhone 5s sales climbing faster than last year’s iPhone 5