Unlimited plan really does mean UNLIMITED (email from Verizon)
I recently saw a message somewhere on here where someone asked about how much they can tether before VZW notices. Someone mentioned even though we have an unlimited plan, there is a 5 gig cap. I thought the same thing too so I email VZW about the data usage. Basically, I asked about being notified before I reach my 5 gig cap and this was their response. (I also asked other things, but this was the 3rd response)
Hopefully this will put an end to the debate.
3. There is no 5 gig cap on your wireless phone for data you have unlimited access and will not be charged for megabytes. The 5 gig cap is only for Broadband wireless service for laptops.