I switched from the Libre to the Dexcom G6 recently. I use my iPhone to track my diabetes numbers. Unfortunately the tech people at Dexcom are working out the bugs in the Apple update and only approve theIr system up to the Apple iPhone 11 so far. So the Bluetooth sometimes fails and the help button gives a fail signal. Hang with it. The numbers keep churning. You have to be patent. What is your experience?