Bluetooth File Manager for Nokia 5800 XpressMusic is an application to browse and copy files from other devices. Here are some screenshots of the application

The application supports multiple languages and it makes bluetooth file transfer very easy. You can download this Java application for Nokia 5800, Nokia N97, Nokia 5530, Nokia 5230, Nokia 5233, Nokia X6 from here.

Device Diagnostics is a very useful application for Symbian S60 V5 mobiles (Nokia 5800 XpressMusic, N97, N97 Mini, X6, 5230 and 5530 XpressMusic). With the Diagnostics application, you can test several features of your device.

Following are some of the available diagnostics tests:

Network Coverage Test: Checks the current signal strength, Operator info, presence of SIM card, offline profile and roaming status.

Internet Connectivity Test: Checks the internet access settings on the device and identifies the working settings for seamless internet access. If no settings are found, the test updates the device with new settings based on current service provider.

Battery Charger Test: Checks if the charger is connected and whether the device charges properly.
Earpiece Test: Plays Nokia ringing tone over the earpience.
Loudspeaker Test: Plays Nokia ringing tone over the speaker.