The most common reasons why the Arccos Link Pro may not be connecting to your phone are: 

1. Software Update: Please make sure you are on the latest app version of the Arccos Caddie app. We only support iOS 16 and newer, so if you are on iOS 15 you will not be able to update to the latest version of the Arccos Caddie app and therefore your Link will not be able to connect.
2. Bluetooth: Please make sure your Bluetooth is 'ON'.
3. Try restarting your phone and connecting again. 
4. Try restarting your Link by turning 'OFF' and then back 'ON' using the power switch on the side.

Note: Connect the Link Pro in the 'Start Round' section of the Arccos Caddie app, not from the list of Bluetooth devices on your smartphone.