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A mobile phone (also known as a hand phone, cell phone, or cellular telephone^[1]) is a small portable radiotelephone.

The mobile phone can be used to communicate over long distances without wires. It works by communicating with a nearby base station (also called a 'mobile tower') which connects it to the main phone network. When moving, if the mobile phone gets too far away from the cell it is connected to, that cell sends a message to another cell to tell the new cell to take over the call. This is called a 'hand off,' and the call continues with the new cell the phone is connected to. The hand-off is done so well and carefully that the user will usually never even know that the call was transferred to another cell.

As mobile phones became more popular, they began to cost less money, and more people could afford them. Monthly plans became available for rates as low as US$30 or US$40 a month. Cell phones have become so cheap to own that they have mostly replaced pay phones and phone booths except for urban areas with many people.

In the 21st century, a new type of mobile phone, called smartphones, have become popular. Now, more people are using smartphones than the old kind of mobile phone, which are called feature phones.

History[change | change source]

Mobile phones in the 1950s through 1970s were large and heavy, and most were built into cars. In the late 20th century technology improved so people could carry their phones easily.

Although Dr. Martin Cooper from Motorola made the first call using a mobile phone in 1973 (using a handset weighing 2 kilograms), it did not use the type of cellular mobile phone network that we use today.

The first cellular mobile phone networks were created in 1979 in Japan. Now almost all urban areas, and many country areas, are covered by mobile phone networks.

Technology[change | change source]

A cell phone combines technologies, mainly telephone, radio, and computer. Most also have a digital camera inside.

Cell phones work as two-way radios. They send electromagnetic microwaves from base station to base station. The waves are sent through antennas. This is called wireless communication.

Early cell telephones used analog networks. They became rare late in the 20th century. Modern phones use digital networks.

The first digital networks are also known as second generation, or 2G, technologies. The most used digital network is GSM (Global System for Mobile communication). It is used mainly in Europe and Asia, while CDMA (Code-Division Multiple Access) networks are mainly used in North America. The difference is in communication protocol. Other countries like Japan have different 2G protocols. A few 2G networks are still used. 3G are more common, and many places have 4G.

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: 850, 900, 1800 and 1900 MHz. Europe uses 900 and 1800 MHz and North America uses 850 and 1900 MHz.

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Today there are mobile phones that work on two, three or four frequencies. The most advanced phones work on all frequencies. They are called 'world' phones and can be used everywhere.

Shapes[change | change source]

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.

How mobile phones work[change | change source]

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.

Networks and payment[change | change source]

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.

There are two main ways to pay for mobile phone calls:

1. Contract

   If you pay by contract you will pay the network money every month so that you can make calls. Usually you can talk for a lot of time for the monthly fee, but if you do not use the phone a lot you still pay the same money.

2. Pay as you use

   If you pay as you use, you will pay for a fixed amount of call time credit which you then use up when phoning people. Once the credit is used up you must buy some more to use the phone. This can be cheaper if you do not use the phone a lot.

Mobile phones use different technical standards. GSM phones need a separate microchip, called a Subscriber Identity Module or SIM card, to work. 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. It is usually impossible to switch to a different network's code on this type of phone. The majority of these CDMA phones are used in the United States and nearby countries.

Smartphones[change | change source]

Main page: Smartphone

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. Examples of smartphones include Apple'siPhone (which uses iOS software) and Samsung's Galaxy series, one of many phones that use the Android platform made by Google.

Mobile case[change | change source]

Cases, which are designed to attach to, support, or otherwise hold a smartphone, are popular accessories. Some have a keyboard built in. Case measures are based on the display inches (e.g. 5 inch display). There are different types:

• Pouches and sleeves
• Holsters
• Shells
• Skins
• Bumpers
• Flip cases and wallets
• Leather case
• Screen protectors and body films

In the 21st century, a new type of mobile phone, called smartphones, have become popular. More people are using smartphones than the old kind of mobile phone, which are called feature phones covers^[2]

Holsters are commonly used alone for devices that include rubberized padding, and/or are made of plastic and without exposed rigid corners. Heavy duty cases are designed to protect from drops and scratches.

Related pages[change | change source]

References[change | change source]

1. ↑Ulyseas, Mark (2008-01-18). 'Of Cigarettes and Cellphones'. The Bali Times. Retrieved 2008-02-24.
2. ↑Lunden, Ingrid (2 June 2015). '6.1B Smartphone Users Globally By 2020, Overtaking Basic Fixed Phone Subscriptions'. Artgiri. Archived from the original on 28 January 2018. Retrieved 6 February 2018.

Xiaomi has unveiled its Quad-Curved Waterfall Display Concept smartphone. The smartphone takes a different approach to curved display as it is not just limited to the sides but at the top and bottom too. In the media release, Xiaomi says that the “revolutionary hyper quad-curved 88-degree surface” was not easy to make as the glass was made using hot-bending glass at a temperature as high as 800-degree Celsius to achieve the form factor.

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The unibody design of the smartphone with a curved display on all sides means that it is a port-free device. Not just wireless-charging but the concept smartphone may also include support for Xiaomi’s recently unveiled ‘Mi Air Charge technology’ which can charge the smartphone at 5W from a distance using unique hardware.

The concept smartphone has an under-display camera to avoid any cutouts even though the technology is yet to be seen on a commercial smartphone from the company yet. Also, it has an e-Sim, pressure-sensitive touch sensors, and built-in speakers inside “flexible film display acoustic technology”.

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Despite the efforts taken to curve the display even further the device may just end up being another concept device like the Mi Mix Alpha which had a unique design with display wrapping it. However, The Verge revealed that a Xiaomi representative told them that the device exists and has been used by people in the company.

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The unveiling of the new smartphone also hints at the company’s aim to make a completely portless device by getting rid of Type-C charging. Last year, Xiaomi also unveiled 80W wireless charging which future devices from the Chinese smartphone maker can support.