That's a big jump from 250MB to 2GB. You might want to add <500MB and <1GB .. In the UK at least, the "unlimited" cap is set at ~500MB.
Until the advertising standards people get hold of it, I expect. Rather like "Up to 8Mb/s" broadband, it's just asking to be taken down, but it seems likely that carriers will continue to brand obviously limited packages as "unlimited" until they're forced to be more honest.