How do I pair a Dexcom receiver with a sensor that already works on iPhone?
Answer
On the Dexcom receiver, open Settings, go to Sensor, confirm the sensor code if asked, then choose Start New Sensor. The receiver and phone cannot always share one active sensor session the same way—follow the receiver menus for your model year.
Before you start: stop right away if…
- Glucose device setup guidance is not medical advice. Follow your care team's instructions for treatment decisions.
Follow these steps
Read the exact receiver status
Wake the Dexcom receiver and note the exact on-screen text, especially No Alerts, Start New Sensor, a warm-up countdown, or only moving dots.
You should see: You know whether the receiver is waiting to start a sensor or already mid warm-up.
Open Sensor settings on the receiver
On the receiver, go to Settings, then Sensor. If your model does not show Sensor in Settings, stop and check the official Dexcom guide for that receiver year instead of forcing unrelated menus.
You should see: The Sensor settings screen opens, or you confirm this receiver uses a different start path.
Enter or confirm the sensor code
When prompted, enter the sensor code from the same sensor already working with the iPhone. Confirm the code carefully before continuing.
You should see: The receiver accepts the sensor code.
Start the new sensor on the receiver
Go back if needed and select Start New Sensor. Keep the receiver near the sensor during warm-up and wait for the timer or first readings instead of restarting repeatedly.
You should see: The receiver shows warm-up progress or begins displaying glucose readings and alert options.
Compare phone and receiver behavior
After warm-up, confirm whether both devices show readings. If the receiver still fails while the iPhone works, note the exact receiver message and contact Dexcom support with your receiver model year.
You should see: Either both devices report glucose data, or you have a clear error to give support.
Not sure this is the right page? Check here
0 of 5 checked
Extra tips
What to look for: Receiver messages such as No Alerts, Start New Sensor, a warm-up timer, or moving dots, plus whether Settings includes a Sensor menu on your receiver.
Before you change anything: Have the sensor code from the applicator packaging ready. Know whether you are using a 2022 or later Dexcom receiver model. Do not remove a working sensor from your body just to test pairing. This is device setup help only—follow your clinician's guidance for glucose treatment decisions.