iPhone Explorer is a free utility that lets you access your iPhone and iPod touch’s root partition. You can import/export pictures, music, videos, ringtones, and messages from your phone.
An advantage of this utility is that you can transfer media files to your iPhone or take back it to your computer without the need of iTunes. This will prevent iTunes sync issues like losing entire music library on some iPhones/iPod.
Want to stop a phone call that always disturbing you? The freeware application StopCall helps you block any calls that you do not want.
StopCall works on devices running Symbian S60 3rd edition and helps users deal with unwelcome disturbances.
The iPhone Organ is an application for iPhone (also for iPod Touch), that allows you to play electric organ on your iPhone and iPod Touch.
This iPhone application has an intuitive user interface and is simple to use. In addition, it is free and can be downloaded free from iPhone App Store.
Nokia has released a diagnostic tool called Nokia Diagnostics that lets you troubleshoot common issues of your Nokia mobile phone.
You can use this tool, for example, to test network coverage or Internet connectivity, Battery charger, loudspeaker & earpiece test, Sim not inserted properly in the device, etc.
Ovi Maps is probably the best and free mobile phone GPS software which takes you where you want to be and shows you what you want to see, with navigable maps for 74 countries in 46 languages worldwide.
This is similar to Google map which is also free but doesn’t require an internet connection (works offline).