For Medtronic sensor on phone, I trialled the Guardian Connect (standalone CGM with no link to pump) on my old iPhone.
There's a screengrab of the then-compatibility warning on my blog post from the time
Review of the new Medtronic Guardian Connect CGM which allows you to view sensor glucose on iPhone, and uploads to Carelink in the cloud.
www.everydayupsanddowns.co.uk
Obviously that was a long time ago... And things have almost certainly changed by now.
I don't know if Guarduan Connect is what the future releases will use but this lists compatible devices and OS for that
Living with diabetes is like doing everything you do in your daily life while keeping a balloon in the air. It's a constant balancing act.
guardianconnect.medtronic-diabetes.co.uk