Allow nighthawk m2 to access mobile data hotspot

I have been using the nighthawk in a motorhome for the past twelve months.  I have found having data on my mobile phone plan and a separate sim for the nighthawk expensive.  The nighthawk allows for "smart" devices to connect through a single point.  I'd like to be able to have the nighthawk draw data from my phones hotspot rather than a separate sim plan