Upload & Sell: On
Go to your local Best Buy or carrier. Just know that you'll have to sign up for a 2-yr contract.
Me personally, I use my phone. I'm on an unlimited data plan and turn my Samsung Galaxy S3 into a hotspot using PDAnet or FoxFi. No rooting. If you have iPhone, I'm sure there is something for it but will definitely require you to jailbreak your phone. But ultimately, it depends on how much data you have on your cell phone plan. May be cheaper to upgrade the data.