Need phone support? Request a callback. Visit our improved Help page for answers to frequent questions

Dexcom ONE Mobile App

How the app update will affect my Dexcom ONE app?

Last Updated · June 15, 2023

After the app update, you will recognize that alerts settings will be reset to default and other changes reset to default as per the below summary:

App Setting

Reset Values





Low alerts

70 mg/dL or 3.9 mmol/L

‘Low' (Default)


1 hour

High alerts

250 mg/dL or 13.9 mmol/L

High' (Default)



Signal loss

Signal loss alert' (Default)

For more than - 20 mins

Brief sensor issue

Dinging' (Default)

For more than - 20 mins

For technical assistance, please contact technical support

For more information, please visit Support Section with useful FAQs or please contact our Technical Support team. Product User Guides can be found at

5-step learning journey

Discover education resources, organised in a 5-step journey, to learn key information about your Dexcom ONE CGM system, from getting started, your first 10 days, to using Dexcom ONE in the long run.

Step 1: The basics of CGM
Step 2: Getting started
Step 3: Your first 10 days
Step 4: Using Dexcom ONE in the long run
Step 5: Understand your Diabetes trends