Note the bar on the lower side of the screen.
It allows the user to access the main five areas:
Phone - the main page of the application.
Call logs - the list of last incoming/outgoing calls performed by the Abilisphone.
Chat - include an XMPP/Jabber chat/messages client.
E-Presence - the presence state of local users.
Settings - the list of parameters and preferences to be configured to the Abilisphone.