[puff]

Well here's the Terms of Service:
http://www.sprintpcs.com/common/popu...msPrivacy.html

and a few select quotes:

Sprint may terminate service if (1) more than 800 minutes, (2) a majority of minutes or (3) a majority of data kilobytes in a given month are used while roaming.

To protect our network, Services, or for other reasons, we may place restrictions on accessing certain Data Content (such as certain websites, applications, etc.), impose separate charges, limit throughput or the amount of data you can transfer, or otherwise limit or terminate Services

We reserve the right to limit or suspend any heavy, continuous data usage that adversely impacts our network performance or hinders access to our network. If your Services include unlimited web or data access, you also can’t use your Device as a modem for computers or other equipment, unless we identify the Service or Device you have selected as specifically intended for that purpose

Nothing about 5 GB being the limit...