ContextContacts [12] and the Contacts application [7] both
extend a smartphone's phonebook to explore several additional
contextual cues, such as time spent in the current location, phone
alarm profile (vibration on/off, ringer on/off), how many friends
are close-by and whether the phone was handled recently
(indicating that users were near the phone and presumably more
available for communication). They found that people found the
current location and time spent there to be the most useful cues.
Andersen et al.’s system, iSocialize [1], also explored several
awareness cues, such as activity, status, relation and vicinity, and
found that most users were more interested in the cues that