ECG APP IN INDIA.

The A2157 is not sold in the U.S. The U.S. sells the 2095 which will NOT connect to any cellular carriers in India.

And as it seems many India customer do, they buy in Dubai on their return flight and while cellular works, ECG does not.

Also the Warranty is not international, so you would have to pay for all repairs that might have been covered by the warranty.

Cellular Carriers that support the Apple Watch, which models, the radio frequencies each model uses, and the country where they offer service:

https://www.apple.com/watch/cellular

Apple Watch ECG countries

https://www.apple.com/watchos/feature-availability/#branded-ecg

Apple Watch Feature Availability by country

https://www.apple.com/watchos/feature-availability

Cross check each of the above webpages to make sure that if you do not buy your Apple Watch in India that you are not going to be unhappy because something does not work.

The rule is that the ECG app must be approved in A.the country the watch was bought in and B.the country that you reside in.So the ECG will work in India but the cellular part of the watch will NOT work outside of the USA.