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When did touch-tone phones replace rotary dials?

“The Bell System introduced touch-tone dialing in 1963, slowly replacing the rotary dial.”

Reference: AT&T

What are the different types of laptop batteries?

There are currently three types of batteries commonly used to run people's laptops:
1) Nickel Cadmium (Ni-Cd) batteries were the standard technology for years, but are now out of date.

2) Nickel Metal Hydride (Ni-MH) batteries are a cadmium-free replacement for Nickel Cadmium.
3) Lithium Ion (Li-ion) is the battery you want for your laptop and is the current standard for portable power.

When did Alexander Graham Bell patent the telephone?

Alexander Graham Bell received his patent for the telephone on March 7, 1876.

How many people use the internet?

About 5.5 billion people, roughly two-thirds of the world's population, use the internet, according to the International Telecommunication Union.

Another fact

“The Bell System introduced touch-tone dialing in 1963, slowly replacing the rotary dial.”

More from this shelf

What are the different types of laptop batteries?

When did Alexander Graham Bell patent the telephone?

How many people use the internet?