CGM features and fixes · Dexcom ONE+

Dexcom ONE+ alarms not sounding

Glucose alerts are off until you turn them on, and they never override silent, vibrate or Do Not Disturb. Screen Time, Low Power Mode, Focus Mode and Battery Saver can also stop alerts. (Dexcom user guide, p. 7; Dexcom user guide, p. 42; Dexcom user guide, p. 10; Dexcom user guide, p. 61; Dexcom user guide, p. 11)

What the maker says to do

1. Turn on the alerts in Profile > Alerts.
2. Turn the phone sound on and the volume up.
3. Turn off Screen Time limits and Low Power Mode (iPhone) or Focus Mode, App Pause and Battery Saver (Android) for the app.
4. Allow Critical Alerts on iPhone.
5. Check headphones, Bluetooth speakers and watches, which can take the alert.

Dexcom ONE+ is not sold in the US. All facts here come from Dexcom's UK and Ireland pages, the UK App Store listing and the outside-US English user guide (mmol/L). Dexcom says Share and Follow may not be available in all regions.

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 ONE+

• 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 G6
• Dexcom G7
• 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. 7: “No glucose alerts unless you turn them on.”
• Dexcom user guide, p. 42: “Turn on alerts or change settings using the Profile tab.”
• Dexcom user guide, p. 10: “Make sure your phone volume is turned up, not muted, and the speaker works.”
• Dexcom user guide, p. 61: “These phone features stop your alerts and app from working:”
• Dexcom user guide, p. 61: “Android features include: Focus Mode, App Pause, and Battery Saver Mode”
• Dexcom user guide, p. 61: “Apple features include: Screen Time and Low Power Mode”
• Dexcom user guide, p. 10: “Apple users must allow Location Permission and Critical Alerts to use the app.”
• Dexcom user guide, p. 11: “When using accessories such as headphones, Bluetooth speakers, or smartwatches, you may get your alerts on one device only, not all.”

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.