Public Speakerphone Use and the Unilateral Redistribution of Private Conversations

The speakerphone feature of mobile devices enables the conversion of private telephonic communication into a broadcast event experienced by all individuals within auditory range. Unlike private calls, which confine conversational content to the telephone dyad, speakerphone use redistributes this content into the ambient environment without the consent of surrounding individuals (Ling, 2004). Despite its documented prevalence in shared public spaces, public speakerphone use has not been examined as a social behavior with measurable psychological effects on non-participants. The present study addresses this gap by applying the PAIS to speakerphone exposure events in public contexts, treating public speakerphone use not as a communication preference but as a broadcast decision with involuntary audience members.

Participants.

Two hundred and seventy-six adults (M age = 32.7, SD = 6.9) exposed to public speakerphone use in the prior two weeks were recruited at public transit locations and commercial spaces. Exclusion criteria included participants who regularly used speakerphone in public themselves (n = 33, excluded for conflict of interest; their data were separately examined under the title 'Self-Reported Justifications and Whether Any of Them Were Good'). IRB protocol PA-2024-0159 was approved.

Instruments.

The Public Audio Intrusion Scale (PAIS; 18 items, α = .87) measured involuntary information acquisition, distraction burden, perceived acoustic violation, and what the scale terms 'unwanted intimacy' — the experience of knowing details about a stranger's life that no one requested. A control group was exposed to a private call at normal volume at the same distance and heard, correctly, nothing.

Procedure.

PAIS was administered within 2 hours of documented speakerphone exposure.

Involuntary Information Acquisition.

Eighty-seven percent of participants acquired specific personal information about the speakerphone user involuntarily — medical, relational, or financial information they did not seek. Mean information categories acquired per event was 2.3 (SD = 0.9).

PAIS Distraction Burden.

PAIS scores were significantly elevated in speakerphone exposure conditions versus private-call controls, t(274) = 11.4, p < .001, d = 1.36. Distraction duration persisted a mean of 6.1 minutes beyond the call's end.

Unwanted Intimacy.

Seventy-three percent of participants reported PAIS unwanted intimacy scores above clinical threshold — described as knowing significantly more about a stranger than is comfortable given the nature of the relationship, which in this case is none.

The involuntary information acquisition finding establishes that public speakerphone use is not merely acoustically intrusive. It is informationally intrusive — transferring private personal content into a public environment that has no infrastructure for receiving or ignoring it. The PAIS unwanted intimacy data confirm that this transfer is experienced as a kind of imposed familiarity: the bystander knows things about the speakerphone user that are appropriate for a relationship that does not exist.

The post-call distraction persistence (6.1 minutes) suggests that the acoustic intrusion is not bounded by the call's end. The content acquired remains available to the involuntary audience's working memory, continuing to occupy attentional resources after its source has terminated.

The excluded participant data ('Self-Reported Justifications') are summarized in the supplementary materials. The most common justification was 'my hands are full.' Earphones were not mentioned.

Public speakerphone use converts private telephonic content into a broadcast event imposed on all within auditory range without their consent or request. It produces unwanted intimacy, sustained distraction, and a library of personal information about strangers that bystanders would not have chosen to acquire. The authors recommend the cultural reclassification of public speakerphone use as an acoustic violation equivalent to public audio playback without headphones, and propose that pocket-based phone holding constitutes sufficient evidence that hands are not, in fact, full.