If you are planning to sell your Spacetalk watch or have purchased a watch that has been used by someone else, you will need to check a few things to make sure the watch can be set up painlessly.

When you purchase a watch that is not new, make sure you request the watch be un-paired by the seller. If the watch has been previously paired, you will not be able to pair the watch.
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You will get this error:

For security and privacy reasons, a single device cannot be paired with multiple accounts simultaneously. The device must be unlinked from the original owner's account for successful pairing.

The seller should have removed the SIM from the watch before handing it over to you. You will need a SIM and an active SIM plan in order to get the watch working.

Spacetalk SIM cards are sold exclusively through the official Spacetalk website. For availability, pricing, and to purchase a SIM card, visit the Spacetalk Shop.

For more information on what you need to get started, see Requirements for Spacetalk Watch