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You can’t take a blood pressure with just the watch, you have to have a blood pressure device like the Omron Evolv that will physically measure your BP. If you have both of those then you can use the Health app to monitor your BP.
I would recommend:
Sorry, there was a problem. Please try again later.Yes. You do have to have an Apple iPhone in order to view your health stats on your phone. Your iPhone also must have the compatible and up to date OS. I believe the iPhone 6s is the earliest compatible iPhone you can use an Apple Watch with, as long as you have the latest firmware.
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