[pandemicsyn]

I could swear I've also gotten data sync's while in limited connectivity situations, but to be fair could be that occasionally it was just able to phone in enough to do its thing.

Service is back up, so just testing real quick, at least on IOS , turning off wifi/cellular (not airplane mode) - my fenix at least seems to still be streaming heart rate data to the app. Not entirely sure what else will update from local data though (if anything).

[DebtDeflation]

Ok, I just tried again.

Turned off WiFi and put phone into Airplane Mode. Verified that Bluetooth is still connected to the watch.

Go into the Connect app. There's a big red box that says "No Internet Connection."

Heart Rate is transmitting to the Connect App in real time.

However, if I try to run a Sync from Connect, it hangs and then fails.

Turn on WiFi and take phone out of Airplane Mode. Run a Sync from Connect. It completes successfully.

Confirmed - If you complete an Activity and want to sync your watch to your phone with the Connect app, your phone must have an Internet connection.