Phone storage space is always a concern, and Apple hasn't upgraded the minimum storage of their newest phones for a while. Buying a 16 GB iPhone is a bad idea, due to the large space requirements of 4K video, Live Photos, and app sizes that are constantly growing.

There are steps you can take to manage your limited iPhone space, but a new seemingly counter-intuitive tip allows you to clear out lots of space  -- potentially even gigabytes -- with little effort.

To utilize this tip, you simply need to try to download a movie from iTunes that you don't have enough storage space for. You'll want to double-check this first, because if you actually have enough space, you'll be charged for the movie rental (it won't charge you if you're short). To check this, head to Settings > General > Storage & iCloud Usage and confirm the amount of space you have.

Now, head to iTunes on your phone and try to download a movie that's bigger than your free space. Some good choices are War and Peace (1956) at 8.86 GB or Cleopatra at 10.3 GB. Click Rent and after a few moments, you'll be told that you don't have enough space.

Click Settings in this pop-up and again under Storage & iCloud Usage, you should see your free space has increased by several hundred megabytes. Repeat this process a few times until you aren't freeing up any more space and you could have a couple gigabytes reclaimed!

This process is just deleting old temporary files that your phone doesn't need but are taking up space, and this is a convenient method to do it in just a few minutes.

Speaking of movies and iPhones, did you know there are awesome short movies filmed entirely on an iPhone?

How much space did you free up using this method? Tell us how you manage if you're stuck on a 16 GB iPhone in the comments!

Image Credit: Denys Prykhodov via Shutterstock.com