could I pair up my Apple Watch 9 with my I phone with iOS 16?
I can not upgrade to iOS 17 because my application Free Style Libre to monitor my glucose is not compatible with iOS 17
iPhone 12, iOS 16
No, as stated in Apple Watch Series 9 - Technical Specifications
"Apple Watch Ultra 2, Apple Watch Series 9, and Apple Watch SE require iPhone Xs or later with iOS 17 or later.
Features are subject to change. Some features, applications, and services may not be available in all regions or all languages."