Switch Apple series 8 watch from ATT to Verizon
I’m buying a used Apple Series 8 watch that was on ATT. Can it be switched to Verizon?
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Apple watches usually aren't carrier locked. But before you buy this watch, have you seen it in person? If you haven't seen it in person to know it has been prepared properly for a new user, I wouldn't recommend buying it. People come here every day of the week often daily, and sometimes, multiple times daily, who have bought a used Apple Watch, which is activation locked to the person who locked the watch. Don't be one of those people and make sure the watch is truly ready for a new user.
This is what should be done on a watch before it is sold --> What to do before you sell, give away, or trade in your Apple Watch, or buy one from someone else - Apple Support
Unless you know with 100% certainty this has been done, you could wind up wasting your money on a useless, you can never use it Apple Watch.
Read this too --> https://discussions.apple.com/docs/DOC-250001038