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A camera phone is a mobile phone which is able to capture photographs. Most camera phones also record video. Most camera phones are simpler than separate digital cameras. Their usual fixed-focus lenses and smaller sensors limit their performance in poor lighting. Lacking a physical shutter, some have a long shutter lag. Flash, where present, is usually weak. Optical zoom and tripod screws are rare and none has a hot shoe. Some also lack a USB connection or a removable memory card. Most have Bluetooth and WiFi, and can make geo tagged photographs.
Can handy mobile phone or digital camera serve as audio-visual recorder and producer?
Yes, digital cameras can record audio and visual files, and they can also act as a producer but will only work with human control or human interaction.  It can record by itself  but cannot produce unless operated or controlled by man. Cellular phones operate at the radio frequency (RF) part of the electromagnetic spectrum. Electromagnetic induction is the production of an electromotive force across a conductor when it is exposed to a time varying magnetic field. Handy mobile phones or camera phones can vary since not all can record or produce anything. It depends on how they are created or designed and the time they were published.