Minecraft – TNT is ruining the minecraft experience

Assuming the same laws of TNT in the PC/Mac game apply to the Pocket edition, then yes, you can!

However, there are two things to keep in mind:

1. 75% of the diamonds will be instantly "vaporized" in the explosion instead of dropped as items
2. You cannot use a Fortune enchantment when using TNT

Using those numbers, while using a Fortune III pickaxe to mine diamonds will net you an average of 2.5 diamonds per ore block, using TNT to mine will net you 0.25 diamonds per ore block.

So, although you can mine any ore with TNT, it's definitely not efficient (but could theoretically help out in a pinch).

Yes, if you purchase Minecraft Realms (https://beta.minecraft.net/en/realms/). When you create a Minecraft Realm, you have the option to use one of your Singleplayer worlds as a Realms base (it will not harm or delete the map in any way). Realms is coming to Pocket soon. UPDATE: Realms is now in pocket!