Differences Between Minecraft Classic and Pocket Edition
If you're a Minecraft Veteran don't expect to be an instant expert at the Touchscreen game version as there are many differences:
The world is not infinite , nor is there infinite water at world's edge
It lacks many biomes, generated structures, and there are only few small Caverns.
With the survival update many useful tools/weapons have been included. These are: Swords, Shovel,Pickaxe, Axe, and Shears.
Get more information about Minecraft Pocket Edition from 9Game.