SmartThings has an IFTTT channel (one of my favorite things about SmartThings).
The Microsoft band can use Cortana to send a text message.
If Cortana can include a hashtag, you could send a text to IFTTT and control SmartThings basic tasks that way. I use Siri to do this on an iPhone, and intend to use an AppleWatch the same way.
The following method worked out by Will Poirier should work with anything that can send text messages with hashtags.
Which looks like it might include the band. I just don’t know about hashtags.