CGM features and fixes · FreeStyle Libre 3 and 3 Plus

FreeStyle Libre 3 and 3 Plus alarms not sounding

The Libre app lists the causes: alarms turned off, the sensor out of range, wrong phone settings or permissions, Silent Mode on, the app closed, or (Android) the app put to sleep. (Abbott)

What the maker says to do

1. Keep the phone within 33 feet of the sensor.
2. Check the phone's notification settings and permissions for the app.
3. Make sure Silent Mode is not on in the app.
4. Keep the app open in the background.
5. On Android, add Libre app to the apps that are not put to sleep.

In the US, Abbott's Libre app replaces the FreeStyle Libre 3 app, whose App Store listing says it is not the latest app.

A call when readings stop

Glide sends every phone on the profile a lost signal banner after 30 minutes without a reading, and overnight it can call a phone number you verify (Premium). How the lost-signal call works.

More on the FreeStyle Libre 3 and 3 Plus

• Follower app not updating
• Signal loss
• Sensor error
• Warm-up
• Sensor failed early
• Follower not getting alerts
• Compatible phones

Alarms not sounding on other CGMs

• Dexcom G6
• Dexcom G7
• Dexcom ONE+
• Dexcom Stelo
• FreeStyle Libre 2 and 2 Plus
• Medtrum TouchCare Nano CGM
• Eversense 365
• Medtronic Simplera
• SIBIONICS GS1

Sources, quoted

• Abbott: “The sensor must be within range (33 feet) of your phone for you to receive alarms.”
• Abbott: “Check to make sure that you have the correct settings and permissions enabled on your phone to receive alarms.”
• Abbott: “You have enabled Silent Mode in the app.”
• Abbott: “Make sure the app is always open in the background.”
• Abbott: “Put Libre app on the list of apps that will not be put to sleep.”

Every quote is checked against its source page before each update of this site; last checked 2026-10-06. Makers change their apps; the source page is the authority when it differs.