~TELEPHONE~

Antonio Meucci was the inventor of the "telettrófoni" that after was called telephone.
He built a telephone to connect his office with his bedroom because his wife was ill. In 1890 he has published the invent.

The telephone was upgraded with:
· Coal microphone
· Antilocal Luink dispositive
· Disc marker
· Tone marker
· Electric microphone

Funcionament 

The convencional telephone has two circuits: the conversation circuit that is the analogues part and the marking circuit that is responsable for the marking and the calls.

Evolution

In the past telephones were bigs and very heavies. They had a disc marker, but with the passing of the time they will upgraded and they had keyboards, they were lighter and smaller.
The boom was the appearing of the smartphones:

· It is a type of phone built on a mobile computing platform, with greater capacity to store data and perform activities. They have touch screen, radio, gallery, apps, camera, calculator, weather, contacts, calendar. Some examples of branchs of smartphones are: iPhones of Apple, Optimus of LG, Blackberry of Blackberry,Moto of Lenovo, Lumia of Nokia, Xperia of Sony, Galaxy of Samsung...