Some do. Some don't. Look at that directory I mentioned earlier because that's one of the factors where a service might lose some points.Some VPN services will limit the total amount of data you can send and receive, either in one connection session or over a month. Other VPN services will limit the speed of the data, effectively sharing less of their pipe with you than might be optimal. That could slow your browsing experience to a crawl or completely prevent you from watching streaming videos through streaming services.Usually, it's the free services that throttle your usage in these ways. Some paid services will offer a trial, where you can transmit up to a certain data cap before being asked to sign up as a paying customer. That's actually pretty cool because it gives you a chance to try out the performance of their service before paying, but it also gives the vendor a chance to make money necessary to operate the service.Many VPN services claim that they'll provide you with unlimited data transmission if you pay their fee and won't throttle your speeds. Generally, this is true, but I'll give you my standard "unlimited bandwidth" warning: It's been my experience that when a vendor says something is "unlimited," it's almost always limited. Somewhere, there will be a note in the fine print or terms of service that allows the vendor to limit you in some way. It pays to read those agreements.