1. Cell Phone: A mobile telephone or cellular telephone (commonly, "mobile phone" or "cell phone") is a long-range, portable electronic device used for mobile communication. In addition to the standard voice function of a telephone, current mobile phones can support many additional services such as SMS for text messaging, email, packet switching for access to the Internet, and MMS for sending and receiving photos and video.
To know how cell phones work, visit the link below which gives a complete tutorial on the working principle of cell phones.
How Cell Phone Works
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