the cellphone is no longer an auxiliary or supplementary device to their landline telephone. Roughly nine-in-ten Americans own a cellphone and nearly two-thirds own a smartphone. Recent research from the U.S. government shows that almost 43% of adults live in a cellphone-only household – that is, without a landline. As mobile devices become more common and essential, Americans are creating and navigating new norms around these gadgets’ use in social gatherings and public spaces.