I'm sorry to hear that your sensor fell off. It can be quite frustrating when that happens! Let's see if we can get you set up with your new sensor.

### Here’s what you can do:

1. Ensure the Old Sensor is Removed: Since the old sensor is detached, make sure it's completely removed from your skin. Unfortunately, a sensor that has fallen off cannot be reused.

2. Start the New Sensor:
- Open the FreeStyle LibreLink app on your iPhone.
- Once you have your new sensor on, the app should automatically detect it. You will be prompted to start the new sensor.
- If you don't get the prompt, go to the main menu in the app, and look for the option to 'Start New Sensor'.

3. Follow the On-Screen Instructions: The app will guide you through the process of starting the new sensor. Just follow the prompts carefully.

4. If Issues Persist: If you’re unable to start the new sensor after trying this, it's best to reach out directly for support. You can contact our Customer Care Team at 855-632-8658 or complete an online sensor support request form.

Here's a helpful link about what to do if your sensor falls off: What if my FreeStyle Libre 3 sensor falls off before 14 days of use?.

Are you satisfied with the solution I provided, or is there something else I can assist you with?