One of five active Apple iPhone models is the Apple iPhone 5s
The Apple iPhone 4 still makes up over 16% of active iPhone models. And at the bottom is the Apple iPhone 5c. Slightly more than 6% of iPhone users are clutching the plastic coated iPhone. This dovetails perfectly with the recent report that inventories of the iPhone 5c have reached 3 million units, with two million of those phones at contract manufacturer Pegatron and the remaining models sitting on carriers' shelves.
The current iPhone line up is headed by the Apple iPhone 5s with the iPhone 5c as the mid-range offering and the iPhone 4s as the low-end model.
source: Mixpanel via AppleInsider