Hi
@Alanm75, I found the transition from Libre 2 to G7 was seamless. I verified my android phone was compatible with G7 from Dexcom's website; in practice if your phone is not compatible you can't download the Dexcom apps. I know nothing about Insulet.
The G7 has a geolocator within the sensor, which can recognise if you are trying to monitor the sensor from a country which is not formally recognised by Dexcom for G7. Because I didn't have roaming data in France and Germany while out of UK, the G7 app froze on me and insisted I tried to delete then reinstall the app. It worked on Eurostar WiFi, then the French hotel WiFi, but froze once I was away from the hotel. Reinstalling the app didn't work thus I was then summarily denied any access to the app, until I was back in UK. In hindsight I probably should have not deleted and done the reinstallation and the app might have restarted once back in the Hotel. I had to revert to finger pricking. Dexcom initially insisted this "couldn't happen"; I pointed out that it had happened and told them the details of the error message. They then replaced 2 sensors and as a gesture of apology (without admitting liability) they provided me with a Receiver (the equivalent of Abbotts Reader); this Receiver is not affected by the geolocator and works alongside the phone app, yet independently of the app.
Hope your transfer goes well. I find G7 far superior to Libre 2 in the alert (alarm) thresholds and choices of sounds. It has generally been very accurate and reliable for me. Good luck.