How do you set up mobile hotspot with Android pls. 

I'm more than happy to help, but to just clarify. You would like to share your phones internet to your car, correct?

Yes.  There's a wlan password on car but says it's incorrect yet it detects phones wifi signal

 

You can use wlan for internet if you buy DATA from cubic telekom. 

Is there a solution for countries not supported by cubic? E.g. Serbia