Voice Control is launching on its own,also since updating to ios10 there is no menu to turn off Siri between Sounds and Touch id and password Since updating to ios10, voice control intermittently launches itself,also between Sounds and Touch id/password under settings the menu for Siri has disappeared.
Siri is disabled under Restrictions. To re-enable Siri, go into Settings > General > Restrictions, enter your Restrictions password, and enable Siri and Dictation.