Why did my iPhone 5 suddenly gain more storage?

I plugged my iPhone 5 into my computer to view it on iTunes and I noted that I had under 500 MB of space left. I had already known this, but I noticed that more than 8 GB of space was being taken up by the category of "Other".
However, after updating my phone to iOS 8.1 (I has iOS 8 before) & updating to the latest version of iTunes, I noticed that I had over 6 GB of space left on my phone now… The space taken up by "Other" had decreased to under 3 GB.
I went from under 500 MB to over 6 GB of space on my phone just by updating my software… Why did this happen?
No, it wasn't just a glitch producing wrong numbers - I had checked my phone various times before the update & it was definitely under 500 MB. I have checked my phone various times after the updates & it's still over 6 GB.
Can someone explain to me why this happened?

That has happened to me lots of times, but I never gained THAT much. I'm going to be honest, that is a lot. But do not worried. As long as you weren't charged anything, then you are fine!

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