Well when you are in their world with them click the "Quit and Copy Map" button then it will show a world in your worlds with that world!
yes
The different minecraft versions are incompatible.
Yes there is signs in Minecraft Pocket edition
you cant have a minecraft pocket edition username
No, they are no enderman in Pocket Edition of Minecraft 0.8.1
Yes, you can, over Wi-Fi LAN.
When would Minecraft Pocket Edition 12.1 going to be out
Yes, there are villages in the updated Minecraft Pocket Edition.
As of Pocket Edition 0.3.0, cows have been part of Minecraft Pocket Edition. If you have that version or above, then there should be cows.
Minecraft Pocket Edition costs $6.99 in the Google Playstore or the Appstore.
You can not get minecarts on minecraft pocket edition. Also, minecarts are not planned for the next update.
In the minecraft pocket edition you cant get seed because in the computer version you get seeds from tall grass and there is no tall grass in the minecraft pocket edition