What about Cellular Phones?

One of the many advanced inventions known to human are cellular phones. This handy gadget has made the world smaller by making people closer.  Cellular phones or mobile phones is an electronic device that is used for sending and receiving messages through texting, voice calling, video calling or data and packet sending. It is a full-duplex two-way radio used for telecommunication over a broad cellular network known as cell sites. Cellular phones can be classified to either ne be feature phone or smart phone. Feature phones are low-end mobile phones while smart phone are high-end phones.

This tiny little gadget allows the user to be connected to the same network or through the public telephone network. GSM or the Global System for Mobile Communications is today’s most popular standard for mobile telephony. It uses carrier frequencies that are further divided into timeslots for individual phone use. As compared to its counter part which is CDMA or Code Division multiple Access which uses only one carrier frequency and uses many different codes for individual phone use.

Cellular phone is not only a telecommunication gadget; it also stores information relevant to the user such as contact information; schedules; alarm clock; calculators; multimedia gadget; television; radio and a lot more. This is truly an all-in-one gadget especially nowadays that smart phones are integrating every possible practical solution for every communication and media needs of the people.

There is a wide variety of cellular phones to choose from, ranging from the cheap gsm phones to a more advanced smart phones. Unlocked gsm phones have the ability to function even on a changed network and changed frequency band. Usually, there is just a need to unlock phones when the phone is locked to a specific frequency band only. Cheap unlocked gsm phones can still function in the 800MHz, 900MHz or even in the 1800MHz band.