We use the internet as an access tool for different services, for example e-mail, web browsing and newsgroups. But how do we access the internet itself? Well, this is done in many different ways. You can use a normal dial-up modem, a satellite access system, an IR LAN, ISDN or the cable TV network. There are lots of different ways to connect yourself to the internet (or the corporate intranet), and there are pros and cons associated with each.
However, the single, most flexible method is, by a long way, the use of a Public Land Mobile Network, or PLMN. Only a PLMN can give you the ability to access the internet from wherever you are, and only a PLMN can give you this access while you are mobile. This is why PLMNs are becoming so important. When you're at home, there are several different access technologies to choose from. Similarly, when you're at work, there are several possible methods of connecting to the 'net. But when you're out driving your car, the only way of accessing on-line information is via a PLMN.