Verizon’s terms:
“..These Data Plans and Features MAY NOT be used for any other purpose. Examples of prohibited uses include, without limitation, the following: (i) continuous uploading, downloading, or streaming of audio or video programming or games; (ii) server devices or host computer applications, including, but not limited to, Web camera posts or broadcasts, automatic data feeds, automated machine to-machine connections or peer-to-peer (P2P) file-sharing; or (iii) as a substitute or backup for private lines or dedicated data connections. This means, by way of example only, that checking email, surfing the Internet, downloading legally acquired songs, and/or visiting corporate intranets is permitted, but downloading movies using P2P file-sharing services and/or redirecting television programming content for viewing on laptops is prohibited. A person engaged in prohibited uses continuously for one hour could typically use 100 to 200 MB, or, if engaged in prohibited uses for 10 hours a day, 7 days a week, could use more than 5 GB in a month.”

It’s funny they automatically assume you are violating the list they provide. The bits of words like “could” are interesting too.