I recently bought my first smartphone, a Sony Xperia T2 Ultra (D5303). It has 8 Go of total memory space and I add a 16 Go SD Card. Android System (5.1.1) takes 3.58 Go and Google/Android/Sony Applications take 4.19 Go. There is less than 300 Mo of free space. I always have a warning message that says that the memory is nearly full.
There is a lot of application that I never use (Google+, What's new, Docs), but I can't uninstall them nor move them to my SD card.
What can I do to have more free memory on the phone ?