Some time ago, Samsung decided confined the compatibility of their wearables to their products. So if you had another brand smartphone, for example, an LG or Motorola, it was not worth to purchase a Samsung wearable.
With the release of the Gear S2, the doubt remained if that would repeat, but today at the brand event at IFA, Samsung surprised the users.
The new Samsung smartwatch, the Gear S2 and S2 Gear Classic, will not run android wear but will run Tizen and will be compatible with devices from other brands as well. However, some aspects should be taken into consideration, as different APIs could cause some features not to work as it should.
In addition, your device must be updated with the Android version 4.4 or higher and must have at least 1.5GB RAM available. With the Gear S2 will be an application, but there is not yet any information about the release date or if Android users will be able to download it from the Play Store.