After initially announcing iOS support for the Gear S3 in August of 2015, Samsung has published apps for the Gear S2, Gear S3, and Gear Fit2 on the iOS App Store, making them compatible with the iPhone.
Users can download the Samsung Gear S app for the Gear S2 and Gear S3 or the Samsung Gear Fit app for the Gear Fit2. Once the appropriate app is downloaded, Samsung smartwatch owners will be guided through steps to complete pairing the watch, with the user's iPhone.
The Gear S3 smartwatch family is powered by a dual-core 1.0 GHz processor driving a 1.3-inch circular 278 ppi AMOLED display, with 4 GB of storage, and 768 MB of application RAM. Connectivity is provided by Bluetooth 4.2, 802.11n wi-fi, and NFC.
The Gear S3 is large at 12.9mm thick, and either weighs 57g or 62g depending on model. For comparison, the Apple Watch 42mm model is 10.5mm thick and weighs 50g.
Samsung announced Gear S2 compatibility for the Gear S2 in January 2016.