Set up new watch
If you had to replace your old Apple Watch do you have to delete the old one from your phone before trying to pair the new one.
iPhone 13
iPhone 5c, iOS 10
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No you don't have to delete the old one. But to eliminate confusion and to remove all the data from your old watch, read this link on what to do --> What to do before you sell, give away, or trade in your Apple Watch, or buy one from someone else - Apple Support