Voice2Call is a simple app that lets you search and pick a contact from your address book.
The focus of Voice2Call is solely on search, making the contact picking action as fast and hands-free as possible.
To that end the app employs search-by-voice.
Voice2Call can be launched by tapping its launcher icon. Once launched the list of names in your address book is shown together with information on when and how much they have been contacted. This list is sortable by various parameters.
You can select a name in two ways, either by scrolling to it and then tapping on it, or (often faster) by holding your finger on the microphone button and uttering a voice command.

https://play.google.com/store/apps/details?id=com.mapedy.voice2call