# API for Other Mobile Apps or CLI

For cli apps and other mobile apps languages and frameworks that are not yet supported, you can use our API. Here are the guides on how to use them.

## Complete Guides

#### Sign in with Email/Phone Number

Authenticate users by sending a Magic Link or OTP via email, SMS, or WhatsApp.

{% content-ref url="/pages/-M0QVaCMLRWd0jUsIcYn" %}
[Verify Email/Phone Number](/sdk-reference/api-for-other-mobile-apps/api-for-mobile-apps.md)
{% endcontent-ref %}


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.cotter.app/sdk-reference/api-for-other-mobile-apps.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.