Cell phone, mobile phone
In recent years, the rapid development of wireless communications has made cellular phones indispensable products. A cell phone or mobile phone is battery-driven electronic communication equipment, which incorporates a battery in a main body to supply operating power needed by an electronic circuit. A cellular phone includes a cover and a body. The cellular phone is classified into a bar type, a flip type, a folder type, etc. based on an opening and closing method of a cover with respect to a body. A cell phone is provided with a device for adjusting the volume of communication voice and key tones in which the user adjusts the volume of the speaker by manually actuating two volume-adjustment buttons. Typically, the volume adjustment buttons are installed on one side of the cellular phone. In recent years, the rapid development of wireless communications has made cellular phones indispensable products. As mobile communications enters the age of 3G, high-speed and wide-bandwidth wireless communications become a must of the cellular phone.Many cellular phone products have similar functions to PDAs and personal computers due to developments in technology such as small-size color liquid crystal displays (LCD), low power consumption but high-performance system on chip (SOC) devices, and large-volume non-volatile flash memory chips. Also, digital camera lenses have been added as a feature on certain commercial cellular telephones, to allow users to communicate and exchange information through pictures. Mobile phones typically use whip or helix antennas, which have hemispherical coverage patterns. With a hemispherical pattern, the cell phone may be oriented anywhere in azimuth with respect to the cell site without affecting reception, assuming no blocking objects are present.
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