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One of the most useful things is being able to type a quick text to a contact just using your voice. It works through Google Now and while it isn't yet the perfect service, once you get the hang of it you'll be speaking out your texts in no time. If you have Google Now installed then you're pretty much good to go. It's best to have the most recent version of the app, as it's unlikely that this will work on phones running anything before Android 4.1.
Wake up Google: First, wake up Google Now with your key phrase. The first time you ask to send a message you’ll need to give the app access to your contacts so it can send your messages to the right people. Give it permission and you’re set.
Say what you want: Next you need to tell Google Now that you want to send a text and who in your contacts list you want to send it to. It will fill in the requisite details and then take you to the next screen where you can speak out your message.
Say what you mean: You can either tap the microphone icon or say “Ok Google” again to type out your text. When you’re done just tap the send button and the app will do the rest. Remember to speak clearly and you should be fine.