One essential characteristic that defines a mobile network operator is that they must have acquired a radio spectrum license from government agencies before they can provide a mobile phone service on the airwaves within a country. The extent of the spectrum obtained depends on the type of mobile phone technology the operator intends to deploy. For example, GSM and 3G communications require a different frequency range. The operator must also deploy essential equipment in order to offer the services, most notably the radio transmitter network and the core network.

Besides mobile networks, is a strong player in core networks, microwave transport, Internet Protocol (IP) networks and fixed-access solutions for copper and fiber.

There's one last type of wireless network we need to discuss, and it's one with which you're probably intimately and constantly familiar. I'm talking about the ubiquitous wireless network employed by the humble cell phone—or, more common today, the high-tech cellular-data network used by iPhones and other smartphones to connect not only to each other, but also to the Internet.

Understanding Cellular Phone Technology

Cellular phones work much the same way as do the other wireless devices we've been discussing. Signals carrying voice, text, and digital data are transmitted via radio waves from one device to another. In the case of cellular networks, the data is transmitted not to a central hub in a small network of devices (as it is with Wi-Fi) or even directly from device to device (as it is with Bluetooth), but through a global network of transmitters and receivers.

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