Telephone area codes are simply digits put together to show difference between one country and another especially when it comes to identifying where a call is coming from and where it is being directed. Every county has got a special set of codes that one must use in case they want to make a phone call to that country. At the very beginning, there was no exact method employed to determine what digits would be used for which country. One can say it was all about random figures. The most important thing was to know that no two countries had the same country code and therefore there could be no confusion whatsoever.
Some countries have three digits in their country codes while others have just two. United States of America is the only country that has just one digit as its country code. In case you were interested in placing a call to a particular country, all you have to do is identify which country it is, know the country code and dial the number and your number will immediately be directed to that country.
The idea of having telephone area codes is an idea that has helped to simplify the concept of making phone calls over long distances. If you are using a mobile phone to call a number within an area that your service provider covers, there might be no need to add a +. However, if you are calling a number outside your country, you are advised to add the + so that the call can be directed much easier and so that it does not get dropped. The difference between mobile phones and landline phones is that the system that directs calls from mobile phones has a unique identification method. Therefore the telephone area codes are mostly suited for landline phones.