its really hard to tell. i think we both have the same definition of unlimited when it comes to data plan - limited. heheh!
According to MTS, one of the carrier here, they have unlimited data and no cap really. Its a case-2-case basis on how they would flag an account as "excessive" use and may suspend your account. (like 10gb/mo is what they classify as excessive)
But they guaranteed no extra charges if you go over since its an "unlimited" plan. So I guess its alot better in some ways, but again, the definition of unlimited being "no restriction" still does not match.