Apple Watch
Can a used Apple Watch receive messages that belong to the previous owner
Question marked as
Hello,
If the original owner did not follow the steps from the below article their personal information and possibly their messages could be accessed.
"When you erase your Apple Watch
When you erase all content and settings, it completely erases your device, including any cards you added for Apple Pay and any photos, contacts, music, or apps. It also turns off iCloud, iMessage, FaceTime, Game Center, and other services. Your content won't be deleted from iCloud when you erase your device."
I hope this helps.