Because the G6 and G7 smart phone apps work independently of each other, it is possible to wear both G6 and G7 at the same time. However, if a patient wears two CGM sensors at the same time the numbers might be different because they are sensing local tissue glucose levels in separate locations on the body. Dexcom recommends using either Dexcom G6 or Dexcom G7, but not both simultaneously.