Here are a few key job duties for a mobile technician: Communicating with customers to learn about their repair needs. Working on cell phones and mobile devices from various brands, models and operating systems. Troubleshooting devices to identify aspects of the programming that might need repairs. Examples of Cell Phone Technician duties are greeting customers, identifying cell phone problems, fixing issues, running tests, assessing functionality, replacing parts, and maintaining repair records. Perform basic fault finding. Eliminate blacklisting, SIM card or network problems to ensure fault lies with the handset, or accessories. Perform functionality checks in order to eliminate user error. Ascertain the warranty status of a handset in order to eliminate damaged equipment. They have knowledge of different mobile operating systems, hardware, and software. They possess expertise in repairing and replacing screens, batteries, buttons, cameras, and other components. They also ensure that the device functions properly after repair and provide customer support.