Do you need to increase the available device memory, so you can install more applications, and add more content?
Transfer data to the mass memory, a compatible memory card (if available), or to a compatible computer.
You can also remove the following if no longer needed:
Text, multimedia, and mail messages
Contact entries and details
Installation files (.sis or .sisx) for installed applications. Back up the files to a compatible computer.
Pictures and videos in Photos. Back up the files to a compatible computer.
If expired trial or demo applications are installed, remove them.