Hi! I see that you’re having trouble with the FreeStyle Libre 3 app on your iPhone. Could you please tell me a bit more about what exactly is not working? For example, is the app not opening, not connecting to the sensor, or maybe not showing your glucose data? That way, I can guide you more effectively.

Went to change sensor and app didn’t start working

Thanks for the details! So, you changed your sensor and then the FreeStyle Libre 3 app stopped working on your iPhone running iOS 18.5, is that right?

Let's try a few steps to get things back on track:

1. Restart the App and iPhone: Close the Libre 3 app completely (swipe it away from the app switcher) and then restart your iPhone. Sometimes a fresh start helps apps reconnect to new sensors.

2. Check Bluetooth and Permissions: Make sure Bluetooth is turned on in your iPhone settings since the app connects to the sensor via Bluetooth. Also, check the app’s permissions under Settings > FreeStyle Libre 3 to ensure it has access to Bluetooth and Notifications.

3. Scan the Sensor Again: Open the app and try scanning the sensor with your phone to initiate syncing. Hold your phone close to the sensor as recommended.

4. Update the App: Make sure your FreeStyle Libre 3 app is updated to the latest version from the App Store. Sometimes updates fix sensor communication issues.

5. Reinstall the App (if needed): If the app still doesn’t respond after the above, try deleting and reinstalling it. Before doing this, ensure you have logged in or your data is backed up because reinstalling could mean logging in again.

6. Check Sensor Activation: Confirm that the new sensor was properly activated and started. Sometimes, sensors need to be started within a certain time after applying.

If you have tried some of these already, please let me know which ones, and I can suggest some more advanced steps.

Also, sometimes the app can freeze or show a blank screen after a sensor change, reported by other users. Usually, the above steps fix it, but if not, there could be a deeper connection issue requiring Abbott support1.

Let me know how these go! Are you able to try these steps now?