Apple iOS & WatchOS
The minimum requirements to install the My Medic Watch apps on your iPhone are model 5S or newer, with iOS 10 or newer installed. My Medic Watch apps work on Apple Watch Series 3, Series 4, Series 5, Series 6 & SE and Series 7 & 8 & 9 and 10, and will be soon available on the LTE smartwatches standalone.
Note that only Apple smartwatches can be paired with an iPhone