Messages are sent as dots and dashes in a:

Which  stands for North,East,West and South ?

We can talk to people in far - off cities or even in different countries on the:

Some post offices have quick mail service and:

Post offices are present in cities and nearly all:

We can send or receive short messages more quickly by means of a:

Some post offices have quick:

We talk to people on:

Electronic mail is known as:

We write letters or talk on the telephone and we give other news and this is known as: