Im trying to download apps but it says insufficient storage but I have plenty of storage and an sd card I try to download apps like Vine and other apps but, it continuously says insufficient storage and I have an sd card and enough internal storage to download. It makes me angry. Please help, I need don't want but need some apps and it wont let me download.  I have a Samsung galaxy ace style and I got it June 13th. Thanks.
I had the same problem on my Huawei Ascend P2, I did a factory reset and it seemed to work, though I highly recommend copying over to your computer every file on your phone before even trying to do so, I don't know the cause myself, the theories I have are:

Virus
Damaged internal memory

If it still doesn't work after the factory reset then you need to take it to a specialist (unless you are one) and take it apart and replace the memory. 

P.S Don't treat this as a answer as such, I don't have the reputation to comment (which I think they should allow everyone to do instead of risking losing a ton of rep).

P.S.S Have you checked to see if your SD card is being read by your phone?