Good morning, I have Forerunner Music 645. It works all fine when I connect it via cable to Garmin express for windows in my laptop, however, it doesn't pair with my Iphone in Garmin connect mobile App when I try to sync. I activate the bluetooth in the smartwatch from Setting/Pair Iphone and cyrcle icone start twisting with the message "go to mobile app and add device'', which is what I am doing but without success in pairing. The only thing I had done previously is to re-initiate the smartwatch I had been been using with no problems for weeks, so the default settings were re-established. Then I canceled the Garmin connect mobile app, and re-installed again. But still I cannot pair the smartwatch with my Iphone. If anyone could suggest how to solve that, I would really appreciate. Thanks in advance. Enrico