People were asking so i thought i might aswell make a short post
EDIT: If you want to leave a comment asking a question that is fine but I need information to help you troubleshoot, such as, are you playing on the full game (have you bought it) or are you using the free version. Is it updated to the latest version, what ios/android version are you on etc. Most of the problems seem to be with the iPhone version because I haven’t seen many people with problems on android, if any at all.
Please note that multiplayer on the minecraft app is multiplayer ONLY over LAN. This means you CANNOT play online, only with a friend who also has the app and is connected to the same WIFI as you. Hope this clears some issues up :)
Also I have updated this post mentioning android as they are pretty much the same however they are different devices in the way they are programmed to run the app and so the problem might not be the game but compatibility with your android phone, to the minecraft app, to your wifi.
Hopefully that makes sense but I’m sure any problems with the app will be fixed in future updates (which is annoying because there are hardly any)
And I’m no android guru but I know my way around any phone as soon as I pick it up :D
If your minecraft (pocket edition) multiplayer doesnt work, eg: you cant join a friends game:
•Go into options in the minecraft app and make sure it says server is always visible. This is set to the on position by default and you can also change this setting later through the pause menu in-game
•make sure that the iphones/ipods/ipads or android phones/tablets your playing on are connected to the same WIFI network
•update your game to the latest version via the app store or android market
•make sure each person has a different name
•you cannot play over 3G at the moment
•if your WIFI uses a network proxy with a login it wont work (thats how it is now and probably wont change in future app updates)
I will update the list as i find more possible problems
Any other unlisted or unfixed problems leave a comment or Email me and i will do my best to help you out :D