There is no such thing as unlimited. It's simply a marketing strategy for web hosts.
If you read the terms of service for any of the unlimited hosts, it basically states that your account will be canceled if you use a high amount of resources. So yes, it's unmetered, until you use a certain amount of resources. Then it's very "metered".
That's why personally, I have never trusted a web host stating unmetered or unlimited bandwidth and/or disk space. Luckily, I have my own web hosting company now and don't have to worry about poor quality anymore