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The radio waves that the mobile phone networks use are split into different frequencies. The frequency is measured in Hz. Low frequencies can send the signal farther.
Higher frequencies provide better connections and the voice communications are generally clearer. Four main frequencies are used around the world: Today there are mobile phones that work on two, three or four frequencies.
The most advanced phones work on all frequencies. There are different kinds of phones. A flip phone flips open, and is best for calling. A bar phone is shaped like a candy bar, and the keys and screen are on one face.
A slate phone is a phone that has almost no buttons, and uses a touchscreen. Most smartphones are slates. A slider phone slides on rails.
It can slide out number keys or a mini keyboard , but some do both. A swivel spins on an axle. When a mobile phone is switched on, its radio receiver finds a nearby mobile phone network base station, and its transmitter sends a request for service.
Computers in the base station check if the phone is allowed to use the network. The base station covers an area called a cell.
A phone can move between different cells, but will only communicate with one cell at a time. This is why mobile communications are sometimes called cellular communications.
Once connected to a station, the mobile phone can make calls. Because the network knows that the phone is connected to that particular cell, it can also route calls to the mobile phone.
Sometimes the radio connection to the cell is lost, for example when you go underground. This means the phone cannot make or receive calls until the connection is made again.
The network is the company that provides the phone service. In most areas there will be more than one mobile network. Customers choose networks based on how well the different networks work in their area, or by price.
Mobile phones use different technical standards. The SIM has information like the phone number and payment account and this is needed to make or receive calls.
The SIM may be supplied by the same company as the phone, or a different one. Sometimes you can change the network by using a SIM from another network, but some companies do not want this to happen and they lock the phone so that you have to use their SIM.
The others have a special radio inside them that only makes phone calls when the phone is activated. When someone buys a contract, the network gives them a code, that if they enter it into the phone, the phone will then make calls.
A majority of new mobile phones from the 21st century are smartphones. These phones are basically small computers. Besides calling, they can be used for email , browsing the internet , playing music and games , and many other functions that computers can perform.
Most smartphones run a common mobile operating system. This allows developers to make mobile apps that work on many different phones without needing to change the code.
Cases, which are designed to attach to, support, or otherwise hold a smartphone, are popular accessories. Some have a keyboard built in.