Early phones started with a set of digits that were usually 2-digits or 3 digits. These numbers were preceded with a word that designated a local area. For example, "Baldwin-445". Each area used a...
It varies from country to country. The country code can be one digit (+1 = US, Canada, etc.; +7 = Russia & Kazakhstan), two digits (+20 = Egypt; +27 = South Africa; +30 = Greece; etc.), or three...