CGM features and fixes · Dexcom Stelo

Dexcom Stelo alarms not sounding

Stelo notifications follow the phone's settings, so silent mode mutes them. Low Power Mode can delay them, and Optimized Battery Charging, Screen Time limits or a hidden app can stop them. (Stelo (Dexcom); Dexcom user guide, p. 45)

What the maker says to do

1. Turn the phone sound on and the volume up.
2. Turn off Low Power Mode.
3. Turn off Optimized Battery Charging.
4. Turn off Downtime and App Limits, or add Stelo to Always Allowed apps.
5. If you hid the Stelo app on iPhone, long press it and remove Face ID.

Stelo is sold over the counter in the US only. Dexcom says your primary residence and your Stelo account must be in the US.

More on the Dexcom Stelo

• Signal loss
• Sensor error
• Warm-up
• Sensor failed early
• Compression lows
• Compatible phones

Alarms not sounding on other CGMs

• Dexcom G6
• Dexcom G7
• Dexcom ONE+
• FreeStyle Libre 2 and 2 Plus
• FreeStyle Libre 3 and 3 Plus
• Medtrum TouchCare Nano CGM
• Eversense 365
• Medtronic Simplera
• SIBIONICS GS1

Sources, quoted

• Stelo (Dexcom): “For example, if your smartphone is set to silent, then your notifications won’t make a sound.”
• Stelo (Dexcom): “When Low Power Mode is on, notifications may be delayed.”
• Stelo (Dexcom): “When the Stelo app is shut down, you won’t get any notifications.”
• Stelo (Dexcom): “Turn off Downtime and App Limits, or add Stelo to the Always Allowed app list”
• Stelo (Dexcom): “To receive notifications and alerts you must long press the app in the hidden folder and remove Face ID.”
• Dexcom user guide, p. 45: “Make sure your smartphone volume is turned up, not muted, and the speaker works.”

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.