If a Dexcom G5 Mobile CGM sensor session is in progress using my phone as the receiver, do I have to re-calibrate when I pair it with my t:slim X2 pump?

No. An additional calibration will not be required. All sensor session information, including the calibration information, is stored on the Dexcom transmitter, not on the devices connected to it.

NOTE: This is different from the Dexcom G4 CGM, where each connected device has to be calibrated separately.

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