> For the complete documentation index, see [llms.txt](https://docs.cotter.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cotter.app/sdk-reference/android/older-sdk-version.md).

# Older SDK Version

- [Sign In with Device](https://docs.cotter.app/sdk-reference/android/older-sdk-version/android-sdk.md): Our Android SDK offers the easiest way to integrate "Sign in with device" to your android app. You can simply call a function and it does most of the heavy lifting and authentication for you.
- [Authenticate from a Non-Trusted Device](https://docs.cotter.app/sdk-reference/android/older-sdk-version/android-sdk/old-authenticate-from-a-non-trusted-device.md)