Do I Need To Upgrade My Iphone 6 To Set Up My New Apple Watch Apple Watch Series 3

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Hi, I am getting a new Apple Watch Series 3, but I have an iPhone 6. This only runs iOS 12, and I am buying from John Lewis in the UK. Will I need to upgrade my phone to be able to set up and use my watch? Answers needed ASAP! Thank you.

Apple Watch Series 3 (GPS + Cellular) requires an iPhone 6 or later with iOS 11 or later. Apple Watch Series 3 (GPS) requires an iPhone 5s or later with iOS 11 or later. (Apple.com)