How can I update my I phone 6 so I can use my new apple watch
How can I update my phone I have an Apple watch and can’t link it
iPhone 6 Plus, iOS 12
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What series of Apple Watch are you using?
It is very likely that your new Apple Watch has come with watchOS 7, which is compatible with Apple Watch Series 3 and later and Apple Watch SE. Upgrading to watchOS 7 requires an iPhone 6s or later running iOS 14 or later.
Set up your Apple Watch - Apple Support
Your iPhone 6 cannot be upgraded beyond iOS 12 and so is not compatible with your new Apple Watch!