The word "unlimited" implies that there are no limits... Obviously there will always be limits, either arbitrary ones imposed by the provider, or ones which are inherent to the technology in use...
As such, nothing can really be described as "unlimited".
Instead, you could use words such as "unmetered" or "uncapped" when the provider is not placing arbitrary limits on the service, allowing you to make as much use of it as technology permits.
Register
Misuse of the word
The word "unlimited" implies that there are no limits... Obviously there will always be limits, either arbitrary ones imposed by the provider, or ones which are inherent to the technology in use...
As such, nothing can really be described as "unlimited".
Instead, you could use words such as "unmetered" or "uncapped" when the provider is not placing arbitrary limits on the service, allowing you to make as much use of it as technology permits.