Hello Sky101, thanks for asking! This watch is compatible with select Bluetooth capable smartphones using Android OS 4.4 and later with at least 1.5GB RAM as well as iPhone 5 and later with iOS 9.0 and above. Not all features are available with iOS paired smartphones. Gear S3 supported smartphones may vary by carrier and device. For a list of compatible smartphones and features, please visit https://www.samsung.com/global/galaxy/gear-s3/device-compatibility/. For the best results, connect with compatible Samsung Galaxy smartphones. ^Elizabeth