Apple Patent Shows iPhone OS UI with Contacts On Home Screen
Posted on January 14, 2010 by eli courey
The icon can also be used to invoke one or more applications that are personalized to the contact. The icon can be modified to display information related to the contact. In one aspect, an icon associated with an entity can be temporarily displayed on the mobile device based on the proximity of the mobile device to the entity.
The UI goes on to the SMS screen as well. Patent image:
Source: Being Manan