Give your comma three a SIM card and internet connectivity. The comma prime SIM card (plus a comma prime subscription) gives you the ability to:
See how to replace the SIM card in a comma three here.
If you purchased a comma three on or before 2/21/2022 you will need this new SIM card to access comma prime. You can always check your SIM card to confirm: if the SIM has pink writing on it, then it will need to be replaced to activate comma prime.
If you have comma prime on your comma three purchased before 2/21/2022, when you replace your SIM card your comma prime service will continue. No action is required.
If you cancelled comma prime for your comma three, you will need to purchase a new SIM card to reactivate it.