"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." "Manic symptoms of bipolar disorder have been predicted by more outgoing texts and calls, acoustic properties of speech extracted during phone calls (e.g., standard deviation of pitch), and increased movement detected via accelerometry (100, 101). [[Digital Phenotype Signals associated with Bipolar Disorder]]