As far as smartphones being hotspots the answer is YES. As long as the phone is capable of that feature.
Depending on your carrier there might be an extra charge for using your phone as a hotspot. I am with Verizon and I am on their newer phone plan which does not charge for using your phone as a hotspot. I currently use my phone as a hotspot, but if I was going to be doing it for long periods of time, I would do like what Joelek is doing and get a Verizon Jetpack (lets you connect up to 10 devices). I work in computer networking and we use the Verizon Jetpacks a lot at work. The jetpacks act as a router, but if you need a device that needs a network cord plugged in, your out of luck with those.
As far as TV goes in the RV, I just plug the coax into whatever they have, if they have it, otherwise it is whatever the antenna can get. I also bring along a lot of DVD's.
2013 Columbus 295RL
2006 F350 6.0L Crew Cab LB SRW