# Device Authenticator

> For the complete documentation index, see [llms.txt](https://help.1nce.com/llms.txt).

![](/img/1nce-os/1nce-os-device-authenticator/device-authenticator.png)

## Device Authenticator

The Device Authenticator offers a secure and automatic onboarding service for devices. The Device Authenticator is based on the Sim-as-an-Identity principle. Through unique identifiers, each SIM Card is securely authenticated and can be immediately used to send data to the [device integrator](/docs/v2/1nce-os/1nce-os-device-integrator/).

## Sim-as-an-Identity

The `ICCID` of the customer SIM is used as a unique identifier for the device.