So I bought a pair of Sony Bluetooth headphones yesterday to use with my Fitbit Versa and iPhone 7. Started my music playing on hone went into fitbit and selected run, it sat connecting, The Fitbit versa uses connected GPS so connects to the phone via bluetooth to use the phones gps. I found this "Connecting" odd, opened the Fitbit app and it connected, started my run, checked the Fitbit after a couple of mins to make sure all working, "Connecting" again. I paused the run tried to connect again but no go stopped exercise synced app still wouldn't connect. So when I got home disconnected headphones and tried to connect versa connected straight away. I don't know what is having an issue but it seems only 1 Bluetooth device can run at one time.