I probably will have to update my IOS on my iphone. Right now the current update is for 14.2 version. Have you done this and does it work with the G6 sensor?
Yes I have, I updated my phone to that version a while ago and it doesn’t affect the Dexcom apps or anything.
So the update is safe for Dexcom users
Hope this helps 
I am using an iPhone 12 Pro Max with iOS 14.2.1
I am using t:Connect 1.2.1
Dexcom G6 version 1.7.0
Dexcom Clarity 2.13.1
I am having no difficulties personal or technical with any of the above apps. My carrier is Verizon.
Hope this helps.