CGM features and fixes · Dexcom G6

Dexcom G6 alarms not sounding

G6 alerts depend on phone settings: Bluetooth, app notifications, battery, and the Always Sound setting. Bluetooth headphones or speakers can take the sound away from the phone. (Dexcom user guide, p. 167; Dexcom user guide, p. 55; Dexcom user guide, p. 32)

What the maker says to do

1. Keep Always Sound on so alerts sound when the phone is muted or on Do Not Disturb.
2. Turn on Bluetooth.
3. Allow Dexcom app notifications, including on the lock screen.
4. Keep the phone charged and the app running in the background.
5. Test the phone speaker and vibration regularly.
6. After connecting headphones or a speaker, check where the alerts play.

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 Dexcom G6

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

Alarms not sounding on other CGMs

• Dexcom G7
• Dexcom ONE+
• Dexcom Stelo
• FreeStyle Libre 2 and 2 Plus
• FreeStyle Libre 3 and 3 Plus
• Medtrum TouchCare Nano CGM
• Eversense 365
• Medtronic Simplera
• SIBIONICS GS1

Sources, quoted

• Dexcom user guide, p. 167: “When Always Sound is on, you always hear your default and scheduled alerts, no matter what your phone’s mute/Do Not Disturb setting is.”
• Dexcom user guide, p. 55: “Bluetooth on: Your transmitter and app communicate via Bluetooth. If it isn't on, you won’t get alarm/alerts or G6 readings.”
• Dexcom user guide, p. 55: “Make sure you allow Dexcom app notifications to show on your locked screen.”
• Dexcom user guide, p. 55: “Battery charged: The app must always be running in the background and may drain your battery. Keep the battery charged.”
• Dexcom user guide, p. 32: “You have to hear or feel alarm/alerts to react to them, so test your smart device speaker and vibrations regularly”
• Dexcom user guide, p. 32: “After connecting any peripheral devices, make sure that your smart device settings allow you to continue receiving alarms or alerts.”

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.