Running out of free space on your phone especially for the users of the 16GB version iPhone is a common problem for everyone. According to a thread on Reddit this problem is very easily fixable by renting a movie on iTunes.
Тhats right, you read well, this trick can help you reclaim some of your used-up space.
This trick includes renting a movie on iTunes. First, you need to go to your Settings > General > About and under Available check how much free space you have left.
Then, you need to look for a movie that is bigger than your available space. For example if your free space is 2GB look for a movie that is above 2GB and then click Rent. Have in mind that you will not be charged because the phone does not have the available space needed to download the movie and you will get this message:
After you click OK you need to go back to your settings and check your storage again where a significant increase in your available space should be visible. You can repeat this process a number of times when needed.