It may be true that we'll never hear from the OP again but I don't concur with what Bigbearjedi posted so I will post my experience in case someone else reads this thread while searching for info on the same subject.
First off, I don't believe the OP was talking about using his phone as a Hotspot, he was talking about using one of the various windows apps out there that allow you to use your laptop or other wifi enabled computer to create a wifi hotspot in order to share that computer's internet connection with other computers. If that's all the OP wants from a router then the answer to his question is that he doesn't need to buy a router. Just keep in mind that your laptop now becomes a router, it needs to be on and running for any...