To link or unlink a social sign-in provider such as Google, GitHub, or Facebook in a native app, the user can interact with the link or unlink button depending on the desired action. When linking or unlinking a provider, there are no expected validation errors except for an error where the profile to be linked is already linked with another identity in the system [source](https://www.ory.sh/docs/kratos/self-service/flows/user-settings). For native apps, you can follow the native app authentication flow described in the [Social sign-in for native and mobile apps](https://www.ory.sh/docs/kratos/social-signin/native-apps) documentation. This flow involves initializing a login or registration flow, receiving the session token exchange code, and exchanging the code for a session token. However, the information extracts provided do not include specific code examples or API endpoints for linking or unlinking social sign-in providers in a native app. For more information on implementing this functionality, you can refer to the [Ory Kratos documentation](https://www.ory.sh/docs/kratos).