They are used to affect the 'drum' of the speaker and vibrate it according to the electrical impulses sent to it. These impulses are modulated by the sound being sent to the receiver.
What was so useful about telephones was that now people didn't have to go to their contacts or wait a couple days for them to respond to there mail. Instead they just had to click a few buttons and talk.
Telephones'
Telephones were invented in 1876. No major milestone in telephones happened in 2000.
Downloading apps on your cell telephones is one way to make them more useful. Cell telephones can hold a variety of applications, depending on the type of phone you have. One of the most useful apps on a cell phone is a budgeting app. A budgeting app can be used to record all of the expenses you incur in a given day. If you buy a burger at the fast food restaurant or splurge on new clothing, then you can quickly record the purchases on a cell phone with a budgeting app. Otherwise, purchases can be easily forgotten and receipts can be lost.
Every single country on earth has telephones.
5,4546,3545.3 telephones
Telephones are about instant communication with other people wherever they are.
Telephones can able to communicate with other telephones through Public Switched Telephone Network, which transmit voice signal over circuit switching technology.
Wireless telephones are also known as mobile telephones. Examples of wireless telephones are Apple iPhones, HTC phones and Samsung Galaxy tablet/phones.
So they can turn them off & detach whatever they pick up.
Yes, there are millions of telephones and cell phones in Egypt.
5 i think(5~8 telephones)