Siri lets you use your voice to send messages, schedule meetings, make phone calls and more. Ask Siri to do things just by talking the way you talk. It understands what you say, knows what you mean and even talks back.
Using voice recognition technology from Nuance and their service partners, users could make reservations at specific restaurants, buy movie tickets or get a cab by dictating instructions in natural language to Siri.
Cortana is your personal assistant on your Windows Phone. It will help you find things on your PC, manage your calendar, track packages, find files, chat with you and even tell jokes on-the-go.