Google has added few more exciting features in Google Now. Now, you can send messages to a contact in Whatsapp, Viber and other messaging apps just by using voice commands. Google Now will ask you to speak your message and then confirm sending. everything is simple.
If you just want to send simple text message on SMS, speak ‘Ok Google, send a text message to contact.‘ Replace the word contact with the name of the person whom you want to send the message. If you want to send a message on Whatsapp, speak ‘Ok Google, send a Whatsapp message to contact.‘ Similarly for Viber, ‘Ok Google, send a Viber message to contact.‘ Same command can be used for other messaging apps.
This will surely make your work easy. If you hands are busy, you can still send messages with voice commands.
Source: Inside Search