The ZTE MC889A 5G outdoor modem is generally designed to be compatible with various SIM cards and operators, but its unlock status can vary depending on the specific model and where it was purchased.

- The ZTE MC889A supports multiple 5G and 4G frequency bands, making it compatible with a wide range of operators.
- However, if the device was purchased from a specific network provider, it might be locked to that provider. For example, if it was purchased from a carrier like DNA, it could be locked to their network unless unlocked.

To ensure the device is unlocked and can be used with any SIM card, you should check the following:
- Verify the purchase source: If bought from a carrier, it may be locked.
- Check for unlock status: Contact the seller or the manufacturer to confirm if the device is unlocked.

In general, the ZTE MC889A is designed to work with various SIM cards, but the unlock status needs to be confirmed based on the specific purchase details.