iPhone won’t sync. Thinks it’s still attached to old iPhone. Old iPhone days it’s not
watch won’t sync with new phone after being unsync’d from old phone
Apple Watch Series 3, watchOS 7
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To use your Apple Watch Series 3 or later with watchOS 7, you need to pair your Apple Watch with an iPhone 6s or later with iOS 14 or later. Setup assistants on your iPhone and Apple Watch work together to help you pair and set up your Apple Watch.
To use your Apple Watch Series 1 or later with watchOS 6.2, you need to pair your Apple Watch with an iPhone 6s or later with iOS 13 or later. Setup assistants on your iPhone and Apple Watch work together to help you pair and set up your Apple Watch.
To use your Apple Watch Series 1 or later with watchOS 5, you need to pair it with an iPhone 5s or later with iOS 12 or later—Apple Watch models with cellular require an iPhone 6 or later. Setup assistants on your iPhone and Apple Watch work together to help you pair and set up your Apple Watch.