Samsung Galaxy phones include a built-in diagnostics suite that can check many hardware functions before users seek repairs or replace the device. Found under Settings > Device care > Diagnostics > Phone diagnostics, it can test components such as the battery, screen, cameras, microphones, speakers, connectivity, charging system and fingerprint reader, although options vary by model and software version.

The tool can run automatic checks and guided tests, with battery results graded as Normal, Weak or Bad; Samsung recommends seeking service advice for a Bad rating. However, it does not measure overall speed, gaming performance or internet quality, so persistent slowness may instead relate to outdated software, background apps, low storage or system errors. Samsung’s Maintenance mode can protect personal data during repairs.