If you have an iPhone 4, 4s, 5, or 5c, you can download the Stridekick app (just make sure your phone is updated to iOS 9.3 or later) and connect any leading fitness tracker or use manual entry.  

The iPhone 4, 4s, 5 and 5c cannot connect as your step tracking device because these models don't have the part built in, the accelerometer, that tracks steps (this is included in the iPhone5s and newer).  

If you have an iPhone 4, 4s, 5, or 5c and do not own a wearable tracker, one option you can explore is downloading the free Moves app and then selecting manual entry as your device option in Stridekick and manually entering your steps from there.  Moves uses different technology to track your steps so it is able to do this without an accelerometer, however it does tend to drain batteries in our experience. 

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