  Smartphone use has grown rapidly, but the ways it shapes concurrent
face-to-face interaction remains scarcely studied. In our research we have
formulated two new concepts to depict this: 1) Sticky media device illustrates
situations in which a person using a screen media device is difficult to get
fully involved with ongoing face-to-face conversation. Their attention is not
easily removed from the "sticky" device or returns to it quickly even if it is
momentarily removed. This article adds to the theoretical underpinnings of the
concept that we previously described mainly empirically. By 2) bystander
inaccessibility we mean the difficulty of a bystander to a smartphone user to
be aware of what kind of action the user is undertaking with the device and
what the phase of the activity is. Our research is based on the theory of
ethnomethodology. In addition to ethnomethodological analysis of interaction,
we also apply other reseach methods. We illustrate the phenomena of sticky
media device and bystander inaccessibility by analyzing 1) naturalistic video
data, 2) written role playing materials and 3) quantitative data, all of which
concentrate on the overlapping of smartphone use and face-to-face conversation.
