I just picked up a GG-B100-1A3. The G-Shock app contains this model. Indeed, the app was recently updated to V1.9 to support the GG-B100.
The main reason I chose this watch was the Bluetooth syncing. But repeated attempts to connect the watch to the iPhone have failed. I've re-booted the phone and re-downloaded the app many times. Each time, I've gotten this message below. No problem connecting to other Bluetooth G-Shocks, such as my GPR-B1000.
Does anyone have any suggestions?