Oh how things have changed since the first telephone in 1876 !
What started as a way to get multiple telegraph messages across the same lines soon developed into speech and nowadays we have millions of conversations travelling the world at great speed.
Years ago, everything relied on a diaphragm to change sounds into a current and at the other end of the line, the current was used at the other end to convert it back into sound.
Nowadays, although the mouthpiece and earpiece are of similar technology, the signal is digitised and chases at light speed down optical circuits. Also is the more recent development of VOIP - Voice Over IP.
What is VOIP ? This is the technology of sending the audio signal down a digital line through the Internet, racing around the world and converting it back to an audio signal at the other end by a computer or similar device. The benefits?
One of the main benefits is cost. Conversation Audio isn't bandwidth hungry, so it can travel down your Internet connection even if you don't have a very fast connection. If you are already paying for a broadband connection, you can have endless calls to other VOIP connections for "free" - there is no charge for the length of time you spend on a call, nor is the charge of the call determined by distance, so long as they have Internet.
Other services are available too, SKYPE is a popular VOIP service which offers the facility to allow callers to call Landline numbers which are NOT on the Internet by taking the signal into a local phone exchange over the Internet, and then converting the signal to regular audio for the final distance to the receiving telephone. The benefit? Long Distance Calls for the price of a local charge.
There are many benefits to VOIP, and as the service continues to improve and expand, we can see that most or all telephones we be this way.
So the choice remains yours, for now. But VOIP will continue to bite away at the old Analogue phone service.