I’m currently using the Dexcom G7 (10 day sensor) and the Tandem Mobi System or the Tandem t:slim X2 insulin pump, can I change to the Dexcom G7 15 Day CGM System?

The Dexcom G7 15 Day CGM System is not yet supported by Tandem's insulin pumps. Tandem's insulin pumps are currently compatible with the Dexcom G6 and Dexcom G7 CGM sensors (10 day sensors).
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