I have apple watch 6 44m brought in Milano ITALY, and Iphone 12 ProMax brought in Washington US, but I'm living in Kosovo when ECG is not available. Can you activate this feature base in serial Number
Apple Watch Series 6, watchOS 7
No, it doesn't work that way. It can only be activated on a device in your location when that feature is activated in your location. Also, having a mix of devices is also going to make it difficult for you to activate things because of the different regions the devices are manufactured for.
ECG in apple watch 6 44m
