Space problem in Samsung Galaxy Pocket GT-S5300
I have solved my own problem today and I'd like to provide the solution for others that might encounter it. The actual Internal memory for this phone should amount to exactly 0,96 GB or close to that. I got aware of this comparing my phone to another one from the same model. I first tried formatting the Flash memory (or Mass memory) on my phone, but to no avail. So I tried doing a reset and it solved the issue. 

To do this:


Go to Settings.
Choose Privacy.
Select Factory data reset or the corresponding example in your native language. 
Wait for the phone to do its thing. You should see some code/script running on the screen. Now wait.
When everything is loaded and you configured the minimum settings, open the application Task Manager. You should be able to see the correct size.