Nokia Beta Labs has released a new tool called Nokia Diagnostics which will help you diagnose and troubleshoot your mobile phone by running various tests on the phone.
The tests include:
1. Network Coverage test
2. Internet connectivity test
3. Battery charger test
4. Loudspeaker &
5. Earpiece test
Right now the app works only on S60 5th edition phones
Nokia N97, Nokia N97 Mini, Nokia 5230, Nokia 5530, Nokia 5800, and Nokia X6.
Support for S60 3rd Edition devices is coming soon