# Verification for iOS

Verify phone numbers and users in iOS. The Sinch Verification SDK for iOS supports verification of phone numbers via SMS, flashcall, callouts, and by using your mobile data connection. The SDK is also available for Android.

This document provides an overview for developers integrating with Sinch Verification SDK for the first time.

Security note:
In order to securely authorize verification requests your application has to properly implement [Public Authentication](/docs/verification/api-reference/authentication/public-authentication)