To ensure full visibility over the state of your SIM cards each update made to them is tracked as an action in the SIM card actions section of the Mission Control portal and API. This section in the portal can be found by drilling into a SIM card in the SIM cards view and scrolling to the bottom.
Each time an update is made to a SIM card it is added to the SIM Card Actions list with an associated status. As the status of the action changes, the SIM card action resource will get updated with the new status. Each action is logged in chronological order so you can see when the update was applied.
The SIM card actions can also be inspected via the Telnyx API and the specifications can be viewed here.
Operations that are tracked as SIM card actions are:
Enable SIM card
Disable SIM card
Standby SIM card
Data Limit exceeded
Enable Standby SIM card.