The same way you get iron on Minecraft PC/Desktop Edition and Xbox Edition. Just try to find a cave.
You need to craft it out of Iron Ingot and Sticks.
you cant
I don't know if this is accurate, but I found some under a river.
In pocket edition you'll need iron, gold or a diamond pickaxe.
an iron pickaxe will do.
dig down its not hard but to use it you need to melt it
You can use the seed i like pizza and there will be gold, iron, and diamond under your spawn.
If you mean iron then I know what you are talking about. But you find it the same way you would in PC minecraft. Just make a stone pickaxe and try to find iron. You can find it almost at any depth. But you can find it from about -10 blocks to bedrock.
In order to to get iron ingots, you need to smelt iron ore.
put iron ore in the furnace (be sure there is coal in there too)
using 3 diamonds and 6 iron ingots