We are currently aware of an issue that can occur when attempting to sync a Forerunner 220 with a Samsung Galaxy S3.
The Forerunner will successfully pair with the phone, but will be unable to sync/upload with the app. The problem appears to be due to the Forerunner encountering an error while downloading the GPS ephemeris data during it's initial connection.
We do believe we have discovered a temporary workaround, for those experiencing this issue, that seems to work in most cases:
Note: Before attempting the steps below, please ensure that your Galaxy S3 is running Android version 4.3 or higher, the Forerunner is running the latest firmware, and the app is up-to-date.
To temporarily correct the issue, reboot both the phone and the watch and attempt the sync again. During our in-house testing this appeared to correct the issue temporarily. Subsequent sync attempts may require a reboot to be performed again.
We have informed the developers of this issue and they are currently looking into a solution.
Please monitor this thread for any updates.