Dexcom stelo Manual page 48

Tips
Follow Stelo's recommended settings. Certain phone settings or features such as
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Android's Digital Wellbeing and Apple's Screen Time may prevent notifications if
enabled.
Allow the Stelo by Dexcom app's notifications to show on your lock screen. This
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will ensure you receive Stelo notifications and allow you to see notifications
without unlocking your phone.
Make sure your smartphone volume is turned up, not muted, and the speaker
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works. All Stelo by Dexcom app notifications will match your smartphone settings.
They will not override your phone settings.
When you have headphones connected, notifications will only sound through the
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headphones, not on your smartphone speaker.
When using multiple accessories such as headphones, Bluetooth speakers, or
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smartwatches, you may get your notifications on only one, not all. After
connecting any accessories, make sure that your smartphone settings allow you
to continue receiving notifications.
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