When you are looking for unlimited hosting it will be doubtful that you would find a web host that offers all of its functions and services on an unlimited basis. Moreover do provide this sort of service would not only be detrimental to the host but also to the other customers using this company.
There are hosting companies that do offer a number of services that are unlimited or at least un-metered. As a rule of thumb you will get what you pay for but there is a wide margin of pricing on web hosting services between hosts.
There are several factors you should consider when you are trying to find a host that offers unlimited hosting. You should also determine whether or not this host is reliable, the last thing you want is unresponsive support when your sites are down because you hosting provider didn’t pay their hosting or bandwidth bills.
Unlimited bandwidth
There are hosts who state that they will provide unlimited bandwidth, that is the amount of data from your site that is served to visitors to your site. This basically means that you could have millions of visitors to your site. This is something you should probably avoid. Although it sounds good a host providing this service may not be able to sustain it's service. Unless you have a really popular site it is unlikely that you will need that much bandwidth anyway.
Unlimited disk space
The amount of disk space on your server will determine how much you can store. Most sites are relatively small and do not require that much space. There are however certain types of site that do use more disk space such as an image hosting site. In this case finding a host that can offer unlimited disk space would be favourable.
Unlimited add on domains or unlimited subdomains
The amount of add on domains or subdomains dictates how many extra websites you can host on your server. Hosts offering unlimited subdomains is quite common for all but the cheapest hosting. Most peoples requirements would not stretch to needing an unlimited amount of websites but having this service available means you can save money hosting multiple sites on the same hosting package.