> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hologram.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Determine if SIM is standard or industrial-grade using the REST API

> All new Hologram SIMs are industrial grade. Check legacy SIM grade via the links/cellular endpoint and the sim_attribute field.

## How to check SIM grade via the REST API

Use the cellular links endpoint to retrieve `sim_attribute` for a SIM. For information on the difference between a Standard and an Industrial SIM please visit our [SIM Datasheet](/guides/sims/hologram-iot-sim-datasheets).

<Note>
  **Note:** Your SIM must be activated and Live to check the status. If you need to check this for a card prior to activation, please contact us at [support@hologram.io](mailto:support@hologram.io).
</Note>

```bash theme={null}
curl --request GET \
  --url https://dashboard.hologram.io/api/1/links/cellular/{linkId} \
  -u apikey:YOUR_HOLOGRAM_API_KEY
```

Look for `sim_attribute` in the response: `STANDARD` or `INDUSTRIAL`.

```json highlight={13} theme={null}
{
  "success": true,
  "data": [
    {
      "id": 234567,
      "deviceid": 3456789,
      "devicename": "Device Name",
      "orgid": 12345,
      "simcardid": 1234567,
      "tunnelable": 0,
      "partnerid": 1,
      "sim": "8912340000123456789",
      "sim_attribute": "STANDARD",
      ...
    }
  ]
}
```