Why carry around two cellular modems? Are you ever out and about with your computer but not your phone? I've been happy to hotspot my computers and tablets to my phone, which I always have with me.
The only possible issue I can think of is battery life, but if I'm carrying around my laptop I can throw a charge cable in the bag to keep my phone juiced.
The only possible issue I can think of is battery life, but if I'm carrying around my laptop I can throw a charge cable in the bag to keep my phone juiced.