Mobile phone use screening test: Development, validation, and implications for screening excessive mobile use.

Background: Early identification for the addictive use of smartphones would enable timely intervention to minimize suffering from compromised functioning and associated psychological problems. This study is the first such attempt to develop a test for addictive/excessive use of the mobile phone in the Indian context. The present study aims to develop and validate the mobile phone use screening test (MUST) for the Indian subcontinent.