Phones, Cell Phones & Wireless Telephony

Telecommunications devices, including cell phones, satellite radio or Voice over IP, connect us to one another and to the world of information at our fingertips. Learn all about the technologies we depend upon for efficient communication.

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What is the difference between analog and digital cell phones?

There are two popular digital systems in the United States. One is generically known as "digital service," and the other is clearly branded as "PCS."

What does 900 MHz mean in a cordless phone?

I've been looking at cordless phones and have noticed that this area has gotten fairly complicated! For example, what is the difference between 900 MHz and other systems?

What is digital spread spectrum as used in cordless telephones?

Digital spread spectrum (DSS) technology has its roots back in World War II and has evolved into the technology of choice for the cordless phone. Cordless phones are now truly "ready for prime-time" thanks to affordable DSS technology.

Why does the phone still work when the electricity goes out?

One of the relative miracles of modern times is the reliability of the phone system. The power goes out fairly often for most people, but your telephone is always working (as long as you pay the bill). Why is that?

How does a long-distance call work?

When you make a long-distance call, there is an amazing amount of technology working to make your call happen. To understand the computerized systems used today, it's helpful to go back in time and look at how long-distance calls were first routed.

Inside a Cell Phone

On a "complexity per cubic inch" scale, cell phones are some of the most intricate devices people play with on a daily basis. Take a look inside a cell phone.

How Telephones Work

Telephones are one of the greatest technological advances of our time. Do you know how your call gets to its destination? Learn all about how the telephone works in this article.


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