I would never host my sites with a company that says they offer unlimited bandwidth.
That’s a lie. They can’t offer unlimited bandwidth. They can offer you a lot of space, they can offer unlimited emails, unlimited domain hosting, bla, bla, but what costs money is bandwidth.
If you use a lot of bandwidth I’m sure they will tell you that your site is spending too many server resources and you have to change your plan.
Bandwidth is the data transfer that occurs every time your webpage is viewed, or each time a file is uploaded to your server. If your website is a total of 45kb in size (including images and other media), then each hit will require 45kb of bandwidth (data transfer) from your site. No matter who the supplier is, someone must pay for bandwidth. If a host claims to offer unlimited bandwidth, I would suspect their policy would change rather fast if your account suddenly started using 10 gigabytes daily. If your host for some reason does not monitor your bandwidth, then it is likely that their server is paying for a dedicated pipe, and will not add additional bandwidth capacity to the server if that pipe begins to bear a larger load than it can handle. What this means is that the offer is legitimate, but you can expect the speed of the server to become slower in time, and if the bandwidth cable become extremely overloaded, then you can also expect to have frequent downtime.