Question: how do I connect to each other with lan without data or internet on minecraft pocket edition can I use Bluetooth or is there any bugs?

Answer: 
Wireless
--------

Yes, a wireless router will be enough for playing MC PE (even if the router doesn't have Internet connection). Just go to settings in MC PE while playing in a world, select multiplayer and enable both sliders (Multiplayer game and visible to LAN players.)

A way connect without using a router: (Doesn't work on iPad)

Turn on personal hotspot and turn on Wi-Fi on the device which has the world you want to connect (It's called "host"), now you should choose that device from Wi-Fi network list in device settings from the other device.

Bluetooth
---------

Currently MC PE doesn't support Bluetooth multiplayer officially, but there are tricks to do that.

Option 1: (The host must be an iOS (Apple) device.)

Download [Multiplayer for Minecraft PE](https://appsto.re/i6dX7fD) (Paid), set up your server and turn on Bluetooth.

Option 2: (The host mustn't be an iPad.)

Turn on personal hotspot and turn on Bluetooth, your friend should choose your device from bluetooth device list in device settings.

Here's how to enable personal hotspot on [Apple devices](https://support.apple.com/en-us/HT204023) and [Android devices](http://www.dummies.com/consumer-electronics/smartphones/droid/how-to-create-a-mobile-hotspot-with-an-android-phone/).

Last step to do
---------------

If you did one of these, your friend should see your world on world list like this:

![](https://winblogs.azureedge.net/devices/2015/09/Minecraft_Pocket-Edition_Join-game.jpg)

Image source: <https://blogs.windows.com/devices/2015/09/18/how-to-play-multiplayer-minecraft-pocket-edition/>
I'm sorry but on version 1.9 (beta, even when paid) you can't play offline multiplayer anymore... I tried it with my friend updating her ap to this version and I can't get the local server from her phone and when I go to worlds tab > edit world > multiplayer it was enabled but when I play the same time I go to the settings I can't toggle back on... Now I have to connect to internet and sign in my xbox live account...