you really dont. unless its about PE, cause evn on most devices it wouldnt be good for even one person slotted servers. MC Hosting is better suited for PC's due to ram and performance requirements.
android devices wont likely have the hardware to host effectively till people have clean forgotten about MC.
Dont listen to CaelThunderwwing up there. You have to port forward your router and distribute your public ip if you want to do it from your android device. Yo can also make a pe server on a pc, which will give you functions (such as the /say command). This option also gives you plugin options. The software for the pc is called PocketMine MP.
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I'm lost in my own mind while reality keeps moving.
android devices wont likely have the hardware to host effectively till people have clean forgotten about MC.