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What she said . There just isn't a whole lot of official options for Windows Phone at the moment. Some other smartwatches claim Windows Phone support, but require tinkering around or their functionality is very limited and just don't work very well at the moment .Hi and welcome to WindowsCentral.
If you don't like the Band 2, the only other smartwatch compatible with Windows Phone is the Vector. Quick look: Vector Smartwatch and the Lumia 950 | Windows Central