Bit6
Try Bit6Bit6 Overview
A service that provides realtime communication capabilities for your app. Bit6 provides a drop-in SDK that lets you add app-to-app voice and video calling, text, photo, location and video messaging. It can even provide integration with PSTN lines and SMS so you can make calls and send messages to landlines and feature phones from your app. The Bit6 SDK also handles all the identity management and user authentication and discovery through phone number, email, Google or Facebook. The SDK is available for iOS, Android and Javascript for web apps.
