To reset your unpaired Apple Watch Series 3, follow these steps:
1. On your Apple Watch, tap on the Settings app. It can be easily located by its gray gear icon.
2. Scroll down and tap on the “General” option. It should be the third option from the top.
3. In the General settings, scroll all the way down to find the “Reset” option. Tap on it.
4. You will see various reset options, but since you want to erase all content and settings, tap on the “Erase All Content and Settings” option.
5. If prompted, enter your passcode to confirm the reset. This step ensures that only the owner of the Apple Watch can initiate the reset process.
6. For GPS + Cellular models, you will be given the option to keep or remove your cellular plan. If you plan to pair your Apple Watch and iPhone again, it is recommended to keep your plan. However, if you no longer wish to use cellular connectivity on your Apple Watch, you can choose to remove the plan.
7. Once you have made your selection, the reset process will begin. The Apple Watch will display an Apple logo along with a progress bar indicating the reset progress. This may take a few minutes to complete.
8. Once the reset is complete, your Apple Watch will restart and return to its initial setup screen. It is now ready to be paired with a new iPhone or re-paired with the same iPhone.
It is important to note that resetting your Apple Watch will erase all data, settings, and content on the device. Make sure to back up any important data before proceeding with the reset.
I hope this detailed explanation helps you reset your unpaired Apple Watch Series 3 successfully. If you have any further questions or need assistance, feel free to ask.