Minecraft has many glitches yet to be discovered, but here is one that has been out since release. You can actually glitch out of the world on minecraft pocket edition. Since the mobile version of minecraft only has a limited world, you are able to reach the end of it. Therefore, you can actually glitch past the barrier holding you back. Here's how:
Step 1: Load up Minecraft Pocket Edition
You can do this on any OS including on the iPod, Android, or even the Amazon Kindle.
Step 2: Go to the edge of the world.
Keep walking all the way until you get to the corner of the world. It should not take too long.
Step 3: Start building!
When you reach a corner of the world, start building with any solid material and stay on top of it. Keep building until you reach the height limit.
Step 4: Jump into the "grey matter".
Make sure you jump away from land.
Happened to me.
Step 5: Success!
You have glitched out of the world! You can walk around on the outside. This glitch has been out since release. It's still hasn't been patched, so it still works. Go for it! Stay tuned for more Minecraft Pocket Edition updates.