I do get this question is it possible to hack wifi using my mobile. So the answer is yes it is possible to certain state.
Don't get your hopes too high! The process only works if wifi has Wps enabled. You can find if wifi is wps enabled or not by downloading app like androdumper from play store. If it is wps enabled then you can try to connect to the wifi from the same app and it works for most of the time if wifi has wps enabled.
And if wps setting is turned off it will be very difficult or have very less chance, for your device to hack the wifi so don't bother it.
Hope it clear your doubts regarding the topic.
