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Mobile phones When the first mobile phones were introduced, their only function was to make and receive calls, and they were so bulky it was impossible to carry them in a pocket.

Later, mobile phones belonging to the Global System for Mobile Communications (GSM) network became capable of sending and receiving text messages. As these devices evolved, they became smaller and more features were added, such as multimedia messaging service (MMS), which Mobile phones allowed users to send and receive images. Most of these MMS-capable devices were also equipped with cameras, which allowed users to capture photos, add captions, and send them to friends and relatives who also had MMS-capable phones.

A m Mobile phones with advanced features similar to a computer is called a smartphone, while a regular mobile phone is known as a feature phone.

A mobile phone typically operates on a cellular network, which is composed of cell sites scattered throughout cities, countrysides and even mountainous regions. If a user happens to be located in an area where there is no signal from any cell site belonging to the cellular network provider he or she is subscribed to, calls cannot be placed or received in that location.

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