I begin with my usual rant ,Samsung 551 has very limited Memory(173 MB ,140 MB usable) and slow processor 600Mhz. After a month almost all of us ran out of memory (except extreme introverts) I am writing two+ methods EDIT : These methods have already been covered in other threads and XDA forums.I have just compiled them here in one place.Kudos to the app developers and all those who made it possible. For method .1 Requirements : Rooted Phone,Manual labour or good memory,Librarian attitude Titanium back up Method. A.)Fill your internal memory to brim B.)Download Titanium backup from market to phone C.)Back up all installed apps on SD card D.)Create a list of apps backed up E.)Copy the list and the backup folder on comp F.)Delete unnecessary applications and repeat Advantages : Only rooted phone is required Increases space . Backup can be created on computer Less used apps can be kept safely on comp. Disadvantages : App limit. A pain in neck to create a list.