cracking Wifi with android phone
#1
Information 
how to hack wifi passwords? using android phone??
#2
(I will only answer the hashcat related part of the question, because this is the hashcat forum.... how you obtain networks traffic captures is another question not related to hashcat at all,,. hint: hcxtools together with raspberry pi)
You could probably install some APP (like ConnectBot) that allow you to remote in via SSH to a machine you own with (for instance) 8 times Nvidia 1080 ti and effectively you are using your phone to crack hashes. It's as simple as this.
You are directly using your phone to control hashcat Tongue lol

BTW: you should probably use at least "screen" or "tmux" on the remove powerful GPU machine with perfect cooling such that a disconnect won't stop the hashcat process (because disconnects normally lead to killing a process/terminal)
#3
Not tested: https://github.com/JuniorJPDJ/hcxtools-android
A feedback is welcome if you test it.