# 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="ios/ios-sdk-passwordless-login" %}
[ios-sdk-passwordless-login](https://docs.cotter.app/sdk-reference/ios/ios-sdk-passwordless-login)
{% endcontent-ref %}

{% content-ref url="ios/ios-sdk-verify-email-phone" %}
[ios-sdk-verify-email-phone](https://docs.cotter.app/sdk-reference/ios/ios-sdk-verify-email-phone)
{% endcontent-ref %}

## Quickstart Guides

{% content-ref url="../quickstart-guides/ios-quickstart" %}
[ios-quickstart](https://docs.cotter.app/quickstart-guides/ios-quickstart)
{% endcontent-ref %}