"Decreased socialisation**: Participants who relapsed also showed a decrease in the number of social interactions they had, as measured by the frequency of phone calls, text messages, and app usage related to social activities." - [Article - Relapse prediction in schizophrenia with smartphone digital phenotyping during COVID-19 - a prospective, three-site, two-country, longitudinal study]] ""in bipolar disorder, incipient depressive symptoms have been predicted by changes in the number of outgoing text messages, the duration of incoming phone calls, geolocation-based mobility measures, and vocal features extracted during phone calls." [[202506161336 - Call frequency is positively correlated to mania severity]] [[202507161338 - Increased outgoing texts and calls associated with manic symptoms of bipolar]]