Have you got some photos that you've taken with your mobile phone and would now like to download them to your PC? Perhaps you even want to access the filesystem on your mobile phone and modify data. Whatever you want to do, many of these tools allow you to access your phone filesystem as if it were an external hard drive or a portable pen drive.
While a lot of the programs we list here are official programs from Nokia, Motorola, Sony Ericcson, Samsung or Apple, some of them are more of the homebrew variety which offer additional functionality over either a USB interface or via Bluetooth.
Some of the software downloads here also offer the ability to download, synchronize and upload your address book and contact list. Be sure to make sure whether you are running Android, Windows Phone or iOS. In some cases, legacy operating systems such as Symbian are also supported.