Unable to use all the memory of Allview A5 Smiley I bought some days ago an Allview A5 Smiley. I installed some applications and made some photos. Now, I saw that I can't install files bigger than approximately 200 MB because it is only free space on phone. This is strange, because the phone has 4 GB of storage. I looked in Settings and I saw that I still have about 1.5 GB free, but I can't use for applications. Why this happens and how I can fix it?

Some screens shots:

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Thanks!
I had the same problem on an Allview P5 Life and I solved it by simply upgrading to Android 5.0 Lollipop.
I used to have an A5 Smiley before this one as well, and I had the same problem... what I did to make it better was to root the phone and remove the bloatware saving a pretty substantial amount of space. This is however not really recommended and you should do it at you'r own risk.
You could also try to install another ROM. There's no official upgrade but you can probably find an unofficial compatible ROM on the internet. This is a very risky endeavour and I really don't recommend it... even I didn't do it and instead left the phone as-is and gave it to my father who uses it only for calling.

TLDR; There's no official or easy way to get more space. The only two ways that I know of are risky and require at least some technical know-how. You'd be better off getting another phone.