The AT&T iOS SDK is a development kit for multiple AT&T APIs i.e. Speech, Advertising, and In-App Messaging, written in Objective-C. This SDK provides developers a way to integrate these APIs with their mobile applications using Objective-C.
Twilio has released a beta version of its Conversations API. The unified API allows developers to aggregate messages across channels (SMS, MMS, Chat, and WhatsApp) into a single conversation. Additionally, administrators can control the conversation and supplement with experiential features.