If you dont always have your cable on you.
Hook the computer and the android phone up on a wi-fi network and use the app called Software Data Cable
* No need to carry the USB data cable for file transfer
(Drag and drop the files/folders between PC and phone)
* No need to mount and unmount the SD card frequently
* Protect your USB interface on the phone
* No impact to your data plan (WIFI data transfer)
* Protect your phone with a username and password