Yes, you can. But you need to have 'Cheats: On'.
To change games modes in Minecraft Pocket Edition, go to edit world and tap survival or creative
In order to switch game modes in a game of Minecraft, you must Save & Exit the world. Then, when you are about to load the world up, find where it says "Survival" or "Creative" and click that button to change the option to you preferred game mode. Once selected, start-up the world and enjoy.
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You need to turn cheats on and then press / and then type in gamemode c to switch to creative mode or gamemode s to switch to survival mode or gamemode a to switch to adventure mode
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Minecraft is an online game and cannot be cracked. You update Minecraft on your iPod or iPhone by visiting the iTunes stores and clicking the update button.
The Minecraft launcher (when you first start the game) will ask you, when there is an update available, if you want to update or keep the old version.
Mojang tend to update the game every 10-12 months as of 2016.
It is already out. If you want to update your game to it. Open you Minecraft Launcher, click options, and then click force update.
If you have already purchased Minecraft PE, then update the game.
All game modes are installed in the one game when you first download TF2. When new game modes are added they are patched into your game and you can play them after you update your client. (Which starts automatically)
When a Minecraft update comes out, your game will automatically update to the newest version. However, you can change what version you are on by clicking edit profile on the launcher.