Nonverbal communication is a very important part of face to face communication. Both explicit and implicit additions to verbal communication augment the information content of communication. Before telephones did not provide any means for adding nonverbal information to the communication, but now, as the technology has advanced, it is possible to start augmenting also the communication on the phone. Adding a haptic I/O device to a regular mobile phone opens possibilities to add value to communication. We conducted two user studies, one for exploring vibration as additional modality to the communication and one on how the contextual issues affect the pressure and behavior. These studies help to understand how the communication could be augmented and whether there is tacit information about the phone usage that could be delivered as part of the communication. Both studies were field studies. Using vibration as additional modality was studied in a longitude study with couples, while contextual impact was studied as a comparison of the laboratory and field discussions. We find that it is possible to add haptic devices to a mobile phone and create a bidirectional communication channel based on the pressure applied on the phone. When the pressure is mapped to a vibration, it offers a new way of messaging. In addition, we find that there are changes in phone usage even in static laboratory conditions, thus it is possible to collect information about pressure, posture and movement of a person and share it with the discussion partner. ACM Computing Classification System (CCS): H.5.2[User Interfaces]: Haptic I/O, I.3.6[Methodology and Techniques]: Interaction techniques,
