As far as I know no free hotspots are working on Verizon. As far as a couple weeks ago anyway, I tried every one I could find.
On a side note do you have unlimited data? If so you can now use that on Verizon's hotspot plan. It does cost a pretty penny compared to free ($30 a month) but you get to use your unlimited data unlike before. I decided to bite the bullet and use it once I found out. I had a hotspot (MiFi) I was spending $80 a month on because the 4G wasn't strong enough on my GNex at work to use a free hotspot. So now with the strong radios on the G2 I'm using the $30 hotspot unlimited data and still saving $50 since I cancelled my MiFi.