This is my second instructable and it helps you know how to make a Minecraft Pocket Edition nether reactor (it is basically a nether portal in pocket edition).
Step 1: Items
You will need the following:
1) Minecraft Pocket Edition FULL VERSION (must be updated to 0.5 alpha and also, must be on survival mode)
2) 4 gold blocks
3) 14 cobblestone blocks
4) 1 nether reactor core
Step 2: Bottom Layer
In the bottom layer it is supposed to be ordered like the picture above. In the bottom layer there is need 4 gold blocks and 5 cobblestone blocks.
Step 3: Middle Layer
In the snapshot above it shows the middle you will need 4 cobblestone blocks and 1 nether reactor core. So you don't get confused I put gray wool for cobblestone on the bottom layer.
Step 4: Top Layer
In the photo above I will show the top layer for the nether reactor. Like I said on the last one, I put gray wool to show cobblestone for the lower levels so you don't get confused.
Step 5: Conclusion
All together it should look like the snapshot above. To activate the portal you should punch the core, I'm pretty sure you're supposed to use either a iron sword or stone sword. Helpful Hints 1) Put nether reactor far from you house or other values buildings, the reactor will destroy it when it forms. 2) Remember it only works on survival mode. If there is anything wrong with the information that's given please leave a comment.
Step 6: Nether Reactor Core
You will need a few things if you want to make the Nether Reactor Core to make the Nether Reactor to go to the Nether. you will need the following:
6 Iron Ingots
Now all you have to do now is just go to a crafting table and tap on the nether reactor icon to make.