Model : Archer D9

Hardware Version : Not Clear

Firmware Version : 0.9.1 0.1 v0041.0 Build 141027 Ref.40300n

ISP : Optus

Hi

Archer D9 v1
Firmware: 0.9.1 0.1 v0041.0 Build 141027 Ref.40300n

My router is getting its internet from a land line but I want to get the internet from my 4G/smartphone instead. I now also have a LAN with few computers and a printer which share the internet.
What is the best way to configure the router to get its internet from my smartphone hotspot?

Thanks