Samsung galaxy S2 device memory full

Samsung galaxy S2 updated to latest version of stock android OS - 4.x

Device memory nearly full, despite having 2GB storage space and only 827MB apps.

After doing this there was 1GB free space, problem solved.

A simple way to free up storage space is by deleting all the log files in the device memory. Just dial *#9900# on your phone and select option 2 “Delete dumpstate/logcat” in the prompted menu. It's not necessary to root your phone either. 
http://androidforums.com/samsung-galaxy-s2-international/694382-galaxy-s2-low-space-not-enough-storage-error-solved.html