The 3100 Mobile Fault Finder was designed to meet the requirements of point-of-return and service center functional testing. It provides a user-friendly and cost-effective way to identify "No Fault Found" devices being returned from the market. Additionally, the 3100 provides a quick functional verification of mobile devices as they leave the service centre, ensuring proper operation when returned to the customer. The 3100 has no display and is therefore remote controlled from a PC via a simple serial or USB connection. The PC application is very simple to use and provides easy management of mobile characterisation values.