4 How Can I Get ECG on My Apple Watch?
As mentioned in the previous slide, the ECG app is only available on the Apple Watch Series 4. Similarly, the Watch must be running watchOS 5.1.2 or later. The iPhone connected to the Apple Watch must be an iPhone 5s or later running iOS 12.1.1 or later.
It’s also only available in the U.S., Puerto Rico and the U.S. Virgin Islands. Support will roll out to other regions gradually, so you’ll have to be patient if you live elsewhere. Note: Region-switching via the Settings app will not work as it did in the beta versions of watchOS 5.1.2.