eat cereal
Secure Digital (SD) is a memory card developed by Matsushita, SanDisk, and Toshiba for use in portable devices which allows you to store images, audio, and other files for use in mp3 players, camcorders, and cell phones.
An optical audio cable is used to transmit digital audio (AC-3) signal from the source to the receiver, such as from a DVD player to a digital audio amplifier/receiver. You can transmit 5.1 dolby digital or DTS surround sound with an optical audio cable, same as digital coaxial audio cable.
Rugged cell phones are cell phones that are durable and can withstand accidents such as being dropped and handled roughly better than most normal cell phones can.
Cell phones use radio waves for communication.
the example of electronic devices used on every day are- Cell phones Computers calculator digital watches modems and control systems.
The CD was originally invented for audio music and used an analog recording method that is incompatible with the modern digital recording method that can be used for both audio and digital.
Do you mean 'When were the first cell phones sold?' If so, the answer is in the mid 1980s.
Pay Phones
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They are used for stuff.
cell phones are mainly used for communicating such as txting, calling and etc...and for entertainment as well and also for emergencies
There are many more than two types of cell phones used worldwide.