Can my Apple Watch Series 3 OSB upgraded to the new OS7?
Can my Apple series 3 watch operating system be upgraded to the new series 7 operating system question mark
Apple Watch Series 3, watchOS 7
What model iPhone do you have? Wha iOS version is on the iPhone? What version of watchOS do you currently have? See the "Check compatibility with the latest watchOS" section in:
Update your Apple Watch - Apple Support