Which smartphones / operating systems are compatible with my Smart Activity Tracker AM 1700/1703/1704?

The FITvigo app was developed for android and iOS only, other operating systems are not supported.
The Smart Activity Tracker AM 1700/1703/1704 FITvigo is compatible with many smartphones from android version 4.4 as well as with iPhone 5, 5C, 5S, 6, 6 Plus, 6S, 6S Plus, SE, 7, 7 Plus from iOS 9.0 and newer.