I used to do just that. It was cheaper to have a mobile plan with stacks of data and use it as a hotspot for my desktop than have separate phone and internet plans. I since found an extremely basic, extremely cheap phone plan that made it economical to get wired internet separately because I wanted a desktop running on faster wired internet with more data. That sure bit me in the arse!  For what it's worth, I have since had the "installation" done and it turns-out they only give you a box on whatever wall is convenient for them, not you. Tonight I have to buy a 30m ethernet cable that will run along the floor from one end of my house to the other because the NBN installation doesn't give you internet to your existing data ports. To have that, I would need to pay an electrician out of pocket, but I'm not doing that when I plan to move shortly.  The worst part is how tragically close I was. My existing ADSL copper will be cut in October and I plan to move around December/January. Just a little bit either way and I would have used ADSL for all it was worth and then moved to a new house with the NBN already done by someone else. I'm the sucker.