Apple Watch Series 4's ECG Feature Will Work Internationally When Set to U.S. Region
Apple revealed the Apple Watch Series 4 during an event in September, highlighting a new electrocardiogram (ECG) app that will be coming to users in the United States through a watchOS software update later in the year. Regulatory clearance is required for the ECG feature, and because of this it will be limited to the U.S. at launch, although the company is working on approval for other countries.
In a new post by 9to5Mac today, code found within iOS related to the ECG feature suggests that the ECG limitation is based on software, not hardware. This means that gaining access to the ECG app in a non-U.S. territory will be as simple as changing the region of the Apple Watch Series 4 and connected iPhone to the United States.

iPhone region can be changed by going to the Settings app > General > Language and Region, and then selecting the Region of your choice. Those who switch regions should note that the time, date, currency formats, and more will be affected by the change.
The ECG app on Apple Watch Series 4 works by placing a finger on the Digital Crown while wearing the watch. The electrodes in the Apple Watch detect the electrical impulses from your heartbeat and route the data to the S4, where it is converted into a signal for Apple's algorithms. This results in a heart rhythm classification that can vary between a normal rhythm to an atrial fibrillation. All of your ECG results are stored in the Health app in PDF format and can be easily shared with your doctor.
While the FDA has granted de novo clearance for the ECG feature, that's not the same as FDA approval and the agency does not recommend that the ECG feature be used by those under 22 or those who have already been diagnosed with atrial fibrillation. The FDA warns that Apple's ECG app is not designed to replace traditional methods of diagnosis or treatment and is intended for informational use only. The Series 4 is the first ECG product being offered over the counter directly to consumers.
Popular Stories
If you pay for iCloud storage on your iPhone, Apple has a new perk for you, at no additional cost.
iCloud+ is the official name for Apple's paid iCloud storage plans, which range from 50GB for $0.99 per month to 12TB for $59.99 per month in the United States. iCloud+ plans already come with multiple perks for free, such as Hide My Email and HomeKit Secure Video, and now there is another one...
The end of an 18-year era is on the horizon for the iPhone.
Apple reportedly plans to announce a new iPhone SE as soon as next week, and the device is expected to feature a full-screen design with Face ID, instead of a Touch ID home button. That means Apple will no longer sell any new iPhone models with a home button, for the first time since the original iPhone launched.
The home button...
iOS 18.3 was released last month, so the first iOS 18.4 beta should be coming soon. iOS 18.4 is expected to be a more substantial update for the iPhone, with several new features and changes related to Apple Intelligence and beyond.
Apple's website suggests that iOS 18.4 will be released in April, following beta testing. Below, we outline what to expect from the update so far.
Apple...
Apple's next-generation iPhone SE could debut as soon as next week with a launch to follow later in February, reports Bloomberg's Mark Gurman. Apple isn't expected to hold an event for the iPhone SE 4, and will instead unveil the device through a press release.
The iPhone SE 4 is expected to have an iPhone 14-style design, with Apple eliminating the thick bezels and Touch ID Home button of...
The British government has secretly demanded that Apple give it blanket access to all encrypted user content uploaded to the cloud, reports The Washington Post.
The undisclosed order is said to have been issued last month, and requires that Apple creates a back door that allows UK security officials unencumbered access to encrypted user data worldwide – an unprecedented demand not before...
Apple is internally testing iOS 18.3.1 for iPhones, according to our website's analytics logs, which have been a consistently reliable indicator of upcoming iOS versions. The software update should be released within the next few weeks.
iOS 18.3.1 should be a minor update that addresses software bugs and/or security vulnerabilities. Apple Intelligence notification summaries for news and...
Last year, we reported that Apple sued its former software engineer Andrew Aude for providing journalists with confidential information about the company's future plans, including details about the Journal app, Vision Pro headset, and more.
As reported by 9to5Mac, the Superior Court of Santa Clara County on Thursday dismissed the lawsuit after Apple and Aude reached an agreement to resolve...
Apple has yet to release any new devices in 2025, but at least two new products are expected to be announced next week, according to rumors.
Below, we outline the new Apple products that are likely to be unveiled next week.
iPhone SE 4
Apple plans to announce the long-rumored iPhone SE 4 as soon as next week, according to Bloomberg's Mark Gurman.
The new iPhone SE is rumored to...