How did the telephone invention became so useful for humans?

What changed our life is not telephone itself, but communication style. Before telephone was invented, we had to use telegram or letters to contact our friends. Telegram is not convenient and letters takes too much time. The most important advantage of telephone is that it made instant message possible. read more

In my opinion, the reason why the telephone became so useful for humans is that allowed people to do what humans desire most, and that is the ability to instantly connect with other people. Anything that gives people this ability will rise to the top in terms of usefulness. read more

In that time people also communicate by message passing by a person.Person is used to send with the message . Few years back,before invention on telephone , post offices service established and large network of message passing using letters formed.In many sectors this services is still in use. read more