If you want to test your network, Internet connectivity or some hardware on your phone, Nokia labs has released a free tool: Nokia Diagnostics to do just that. The software is free and currently works with S60 5th Edition smartphones like the Nokia N97, Nokia N97 Mini, Nokia 5230, Nokia 5530, Nokia 5800, and Nokia X6. They are also working on a version that will work with the S60 3rd Edition devices.
Nokia Diagnostics makes it easy to diagnose and troubleshoot situations on the mobile phone by running various tests on the phone, including:
1. Network Coverage test 2. Internet connectivity test 3. Battery charger test 4. Loudspeaker & 5. Earpiece test