"Storage space running low. Some system functions may not work" I have  Sony Xperia v3 and I always get the error "Storage space is running low. Some system functions may not work." What should I do to solve this problem?
This question is way too broad and was asked to death, general consensus is 


remove applications and media you don't need, if you are rooted remove unused system apps
move as much applications to sd-card
install a cleaning application (like clean master), they can make a difference
use cloud applications such as dropbox to sync your heavy files across multiple computers and devices, why store all those >5MB pictures you've taken on your limited device if your Hard drive has much more capacity?