My patient is currently on Dexcom G6 and Tandem Mobi. How do they upgrade to be able to connect Dexcom G7?

If your patient is getting Dexcom CGM supplies through:

Durable Medical Equipment (DME) Distributor
Have your patient reach out to them and mention that they would like to upgrade to Dexcom G7.

Pharmacy
Please prescribe your patients Dexcom G7.