> 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/ios.md).

# iOS

## Complete Guides

#### **Sign in with Device**

Allow users to login automatically from a device that they trust.

#### Sign in with Email/Phone Number

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

{% content-ref url="/pages/-M4q-LjGBIcIq3PgnYt6" %}
[Sign In with Device](/sdk-reference/ios/ios-sdk-passwordless-login.md)
{% endcontent-ref %}

{% content-ref url="/pages/-M35aUobglanfiWqjf7S" %}
[Sign In with Email/Phone Number](/sdk-reference/ios/ios-sdk-verify-email-phone.md)
{% endcontent-ref %}

## Quickstart Guides

{% content-ref url="/pages/-M6EaO2M9ot00du8W\_bR" %}
[iOS – Sign in with Device](/quickstart-guides/ios-quickstart.md)
{% endcontent-ref %}