FreeStyle Libre 2 app includes several types of alarms. These are all turned on by default and initially set to sound regardless of your phone's sound or Do Not Disturb settings. If there's a time where you need quiet, you have a couple of options.
You can choose to silence all your glucose and signal loss alarms for a set period by turning on Silent Mode (if available).
You can individually select to turn off the Override Do Not Disturb setting for the High Glucose, Low Glucose, or Signal Loss alarm if you want the alarm to follow your phone's volume setting and be silent when you have Do Not Disturb enabled.
The Urgent Low Glucose Alarm can only be silenced by turning on Silent Mode.
Optional Glucose Alarms: Low Glucose and High Glucose alarms are turned on by default, but can be turned off or customized to alarm at different glucose levels.
Urgent Low Glucose: Urgent Low Glucose Alarm will be delivered when your glucose goes below 55 mg/dL. This alarm cannot be turned off or customized but can be silenced with your other glucose alarms for a set period.
Optional Signal Loss Alarm: Signal Loss Alarm will be delivered when your Sensor isn't communicating with the App. This alarm is turned on by default, but can be turned off or customized.
Fixed System Alarms: Replace Sensor and Sensor Ended Alarms will be delivered when your Sensor needs to be replaced. These alarms are a little different and will always sound regardless of your phone's sound, Do Not Disturb, or Silent Mode settings. These alarms cannot be modified or turned off and indicate you are no longer receiving glucose readings or glucose alarms.
The iPhone app includes an App Stopped Alarm to indicate you have force closed the App.
Please read all the information in this section before setting and using alarms.
IMPORTANT:
Scan your Sensor often to check your glucose. If you get an Urgent Low, Low, or High Glucose Alarm, you must obtain a glucose result to determine what to do next.
The Urgent Low, Low, and High Glucose Alarms should not be used exclusively to detect low or high glucose conditions. The glucose alarms should always be used along with your current glucose, glucose trend arrow, and glucose graph.
Low and High Glucose Alarm levels are different from your Target Glucose Range values. Low and High Glucose Alarms tell you when your glucose has passed the level you set in the alarm. Your Target Glucose Range is displayed on glucose graphs in the App and used to calculate your Time In Target.
Make sure your phone is near you. The Sensor itself will not issue alarms.
If the Sensor is not communicating with the App, you will not receive glucose alarms, and you may miss detecting low glucose or high glucose episodes. You will see the 
symbol on the screen when the Sensor is not communicating with the App. If the Signal Loss Alarm is on, you will be notified if your Sensor has not communicated with the App for 20 minutes.
If you enable Silent Mode in your alarm settings, you will not receive audible glucose and signal loss alarms even if the Override Do Not Disturb setting is on.
If you see the symbol, this means you are not getting alarms. Confirm your settings are as follows:
iPhone settings:
- Allow Notifications is ON
- Lock screen and Banner alerts are ON
- Notifications sounds are ON
Android Phone settings:
- Lock screen notifications are ON
- Alarms & reminders permission (if available) for the App is ON. This permission is required for Android 12 and above.
- Channel notifications or Pop-up notifications are ON
- Battery optimization is OFF
- Phone Media volume is ON
If alarms are unavailable because of any of these settings you will still be able to scan your Sensor to check your glucose. Touch the symbol for more information.
- Disable your phone’s automatic operating system (OS) updates. Prior to updating your phone’s OS or updating the App, you should check the Mobile Device and OS Compatibility Guide to determine if the FreeStyle Libre 2 App is compatible with your OS and your phone. The OS Compatibility Guide is available in the Help Section of the App or on www.FreeStyleLibre.com. You should check the OS Compatibility Guide periodically to make sure that your OS and your phone continue to be compatible with the App.
- In the event that an App or OS update causes your previously compatible phone to become incompatible, you may be notified ahead of time via e-mail or through the App. Make sure that your LibreView account has your current e-mail address to receive important information.
- After an OS update, open your App and check your device settings to make sure it's working properly. Some OS features may impact your ability to receive alarms. For example, if you use an iPhone and the iOS Screen Time feature, add the FreeStyle Libre 2 app to the list of Always Allowed apps to ensure that you receive alarms or if you use an Android Phone do not use the Android Digital Wellbeing app.
- For you to receive alarms, your phone should be within 20 feet of you at all times. The transmission range is 20 feet unobstructed. If you are out of range, you may not receive alarms. If you want to receive the App's optional alarms, make sure these are turned on.
- For iPhone, do not force close the App. The App must be running in the background to receive alarms. If you force close the App you will not receive alarms. Re-open the App to ensure you will receive alarms.
- If you restart your phone, open your App to make sure it’s working properly.
- Glucose alarms you receive do not include your glucose reading so you must scan your Sensor to check your glucose.
- The App will ask for phone permissions which are needed to receive alarms. Allow these permissions when requested.
- Check to make sure that you have the correct phone settings and permissions enabled. If your phone is not configured properly, you will not be able to use the App, so you will not receive alarms or be able to check your glucose.
- iPhones are to be configured as follows:
- In the phone settings, keep Bluetooth ON
- In the phone settings for the App, allow the App to access Bluetooth
- In the phone settings for the App under Notifications, keep Allow Critical Alerts ON
- Android Phones are to be configured as follows:
- In the phone settings, keep Bluetooth ON
- In the phone settings for the App, keep Do Not Disturb access permission ON
- In the phone settings for the App, keep Nearby Devices permission ON. This permission is required for Android 12 and above.
- If your phone is not configured correctly, the App will be in "Alarms Unavailable" state and you will not be able to check your glucose or receive any alarms, including the Urgent Low Glucose Alarm.
- To turn on Bluetooth, Critical Alerts, Do Not Disturb access permission, Bluetooth access, and Nearby Devices permission, follow the instructions in the App.
- For Android Users, you may need to add the FreeStyle Libre 2 app to the list of the apps that will not be restricted or put to sleep.
- If you adjust the phone ringer volume (iPhone) or Media volume (Android Phone) to silent or use the phone do not disturb setting, keep ‘Override Do Not Disturb’ setting in the App ON for Low Glucose, High Glucose, and Signal Loss Alarms to ensure you receive audible alarms.
- You should disconnect headphones or speakers from your phone when you are not using them as you may not hear audio for alarms. If using headphones, keep them in your ears.
- If you are using peripheral devices connected to your phone, such as wireless headphones or a smartwatch, you may receive alarms on only one device or peripheral, not all.
- Keep your phone well charged and turned on.
