Mobile Broadband Router

[IamIronMan]

I have a Nighthawk Mobile router, I recently moved into an apartment with better broadband internet and would like to still use the router as a regular router plugged into my cable modem for wifi. Is this possible? If so how do I configure the router to work when plugged into an ethernet cable from my modem.

I have an ATT sim card in it now but they are switching to TMOBILE and I need more stable internet connection for work. 

Any help would be appreciated.

[JohnPeng]

You can enable ethernet offloading to allow the traffice going through your cable modem instead of your carrier data.

Thanks