There are currently two "ActiLife Mobile" applications in the app store. The older app (shown below) was designed to work with activity monitors with serial numbers beginning with "CLE2." These devices utilize the ANT+ wireless protocol. In order to work with the iPhone, users must have purchased the iPhone ANT+ Wireless Adapter. This application and the adapter are deprecated and support has ceased for this app.
The newer app ("ActiLife Mobile BT") is shown below. This application is designed to work with all activity monitors with serial numbers beginning with "MOS" and utilizes the Bluetooth LE (4.0) wireless protocol to communicate with activity monitors. This app will work only with iPhone 4S and later as it requires the presence of the Bluetooth LE stack, available only in later model iPhones. Support for this application is ongoing and more features will be added.