Nokia Beta Labs has debuted an 'experimental' application, Nokia Diagnostics, aimed at helping S60 5th Edition users diagnose, troubleshoot, and configure their devices "with ease on their own". See below for the launch video and details.

From the Beta labs post:

"With Nokia Diagnostics, you can diagnose, troubleshoot and configure your device using five different tests:

• Network Coverage test. You can get all the network related information and detect offline status & SIM card presence.
• Internet Connectivity test. Perform a real-time Internet connectivity test and identify the setting with which you can have a seamless internet access.
• Battery Charger test. Check if your device charges properly with the charger connected.
• Loudspeaker, Earpiece test. Check your loudspeaker & earpiece functionality.

Please download the application (requires login), try it out on your device, and post your feedback at Beta Labs. In particular, we are interested in hearing about other diagnostic tests you would expect to see in such an application."