A method of duplex transmission of voice streams between a mobile phone client application and an Instant Messaging Voice Over Internet Protocol (IM/VOIP) client application using an audio interface of a smartphone, the method comprising:
- duplex transmission of voice streams between the mobile phone client application and the IM/VOIP client application using a connection between an audio output and an audio input of an audio interface of the smartphone;
- and
- managing the mobile phone client application and the IM/VOIP client application using software of the smartphone without direct tactile communication with a user.