It is not intended for use by people under 22 years old or those who have been previously diagnosed with atrial fibrillation (Afib). Irregular rhythm notification requires the latest version of watchOS and iOS.With the ECG app, Apple Watch is capable of generating an ECG similar to a single-lead electrocardiogram. ECG is not intended for use by people under 22 years old. The ECG app is available on Apple Watch Series 4 and later (not including Apple Watch SE) with the latest version of iOS and watchOS.Blood Oxygen app measurements are not intended for medical use, including self-diagnosis or consultation with a doctor, and are only designed for general fitness and wellness purposes.If your iPhone isn’t nearby, your Apple Watch needs to be connected to a known Wi-Fi network and you must set up Wi-Fi Calling.
To use Emergency SOS on an Apple Watch without cellular, your iPhone needs to be nearby. Apple Watch Series 7 (GPS + Cellular) and Apple Watch SE (GPS + Cellular) can use a cellular connection for Emergency SOS.Data from the Cycle Tracking app should not be used to diagnose a health condition. The Cycle Tracking app and predicted fertile windows should not be used as a form of birth control or to support conception.For a list of Apple Pay countries and regions, visit /en-us/HT207957.
* Apple Watch Series 7, Apple Watch SE, and Apple Watch Series 3 have a water resistance rating of 50 meters under ISO standard 22810:2010.Have a question? Call a Specialist or chat online.