Tap the Voice Dial switch to turn on o desactivar .
Touch and hold the Home button to access Siri (or Voice Control if Siri is turned off).
If Siri is turned off, Voice Control allows you to make some simple requests (call a number, play a song) using voice commands.
Speak into the microphone and say "call" before the contact or number you wish to dial.
If you have multiple entries for a contact, choose the desired name or number when prompted.