To view how much memory is available for different data types, select Menu > Office > File mgr..
Many features of the device use memory to store data. The device notifies you if available memory is low.
To free memory, transfer data to an alternative memory (if available) or compatible computer.
To remove data you no longer need, use File manager or the respective application. You can remove the following:
Messages in the folders in Messaging and retrieved e-mail messages from the mailbox
Saved web pages
Applications shown in Application manager that you do not need
Installation files (with .sis or .sisx file extensions) of installed applications. Back up the installation files to a compatible computer.
Images and video clips in Photos.