<P> Satellites in geostationary Earth orbit (GEO) operate in a fixed position 35,786 km (22,236 miles) above the Earth's equator . At the speed of light (about 300,000 km / s or 186,000 miles per second), it takes a quarter of a second for a radio signal to travel from the Earth to the satellite and back . When other switching and routing delays are added and the delays are doubled to allow for a full round - trip transmission, the total delay can be 0.75 to 1.25 seconds . This latency is large when compared to other forms of Internet access with typical latencies that range from 0.015 to 0.2 seconds . Long latencies negatively affect some applications that require real - time response, particularly online games, voice over IP, and remote control devices . TCP tuning and TCP acceleration techniques can mitigate some of these problems . GEO satellites do not cover the Earth's polar regions . HughesNet, Exede, AT&T and Dish Network have GEO systems . </P> <P> Satellites in low Earth orbit (LEO, below 2000 km or 1243 miles) and medium Earth orbit (MEO, between 2000 and 35,786 km or 1,243 and 22,236 miles) are less common, operate at lower altitudes, and are not fixed in their position above the Earth . Lower altitudes allow lower latencies and make real - time interactive Internet applications more feasible . LEO systems include Globalstar and Iridium . The O3b Satellite Constellation is a proposed MEO system with a latency of 125 ms . COMMStellation TM is a LEO system, scheduled for launch in 2015, that is expected to have a latency of just 7 ms . </P> <P> Mobile broadband is the marketing term for wireless Internet access delivered through mobile phone towers to computers, mobile phones (called "cell phones" in North America and South Africa, and "hand phones" in Asia), and other digital devices using portable modems . Some mobile services allow more than one device to be connected to the Internet using a single cellular connection using a process called tethering . The modem may be built into laptop computers, tablets, mobile phones, and other devices, added to some devices using PC cards, USB modems, and USB sticks or dongles, or separate wireless modems can be used . </P> <P> New mobile phone technology and infrastructure is introduced periodically and generally involves a change in the fundamental nature of the service, non-backwards - compatible transmission technology, higher peak data rates, new frequency bands, wider channel frequency bandwidth in Hertz becomes available . These transitions are referred to as generations . The first mobile data services became available during the second generation (2G). </P>

Which actions allows you to access the internet on your laptop via a cellular network
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