So he showed me this simple trick, and I was wondering, how come no one shared this with me before? Here's the step-by-step!
1. Go into Settings app and tap General > About to look at your current storage space. That is the "before" number.
2. Step 2: Open the iTunes Store app, head to movies, and find any really large title. One of the HD videos would suffice. The idea is to find a movie that requires more space than what you currently have in your phone. Tap the Rent button twice, you're not actually end up it (and therefore won't be charged anything). If you are worried, I can assure you that because there's no space, the movie won't be transferred so charges won't be imposed on you or do what I do, remove the credit card information from your account.
3. Once you see the message that there's not enough space available to download your rental, go into Settings. Head to General > About and you should see a some free space shown. Think you can squeeze more out of your iPhone/iPad? Repeat Step 1 - 3 again until you maxed out the space saving.
Interesting right? I believe what the system automatically clear out caches that's been taking up space to squeeze in more products into your devices and repeating it a few more times will help clear more.
I've repeat this process on my devices about 5 times but the limit is always the 1.9GB so I guess that's the only space I have left to play with unless I remove my music and portfolio videos.