In addition to searching the web by speaking, you can use Voice Actions to call your contacts, get directions, send messages, and perform a number of other common tasks.
at the upper right. A dialog with a microphone icon opens.When you're finished speaking, Voice Search analyzes your speech and initiates the action.
If Voice Search didn't understand what you said, it presents a
list of similar-sounding search terms and actions, which you can
touch to choose.
Some Voice Actions, such as "send email" and "note to self", open a
panel that prompts you to complete the action by speaking or typing
more information.
When confident that the transcription is accurate, Voice Search displays transcribed words as regular text. Words or phrases for which it has provided alternate transcriptions are underlined.