The Twilio Client for iOS is now available to developers, allowing them to easily integrate voice and presence into mobile apps using the data connection of their iPhone, iPad, or iPod Touch. The company is hosting a developer contest to encourage innovation, with prizes including $50 in Twilio credit and an iPad 3 for the top winner. Developers can submit their apps that incorporate Twilio's new iOS SDK, which includes documentation, helper libraries, and sample code to help them get started. The contest challenges developers to build unique mobile experiences, such as mobile games, social apps, or mobile commerce solutions, using Twilio's voice and presence features. Entries must be submitted by March 11th and will receive recognition on the official Twilio blog, while the top winner will take home a grand prize of an iPad 3.