You're seeing a lot of iPhone opens in your User Agents stats because iPhones open emails differently than other email applications.

We use a tiny, one pixel graphic (or web beacon) that gets downloaded when a subscriber turns on images to track which emails have been opened and which haven't. When someone uses their iPhone to open your email, it automatically opens images, downloading our tracking graphic. Most email applications turn images off by default and force users to click a button to display them, resulting in lower open rates.

This can result in an inflated percentage of iPhone users showing up in your User Agents stats. We'll see every user who uses their iPhone to open your email, but we only catch the subscribers that turn on images in other email applications.

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