National roaming is a sensitive subject. Many feelings but maybe less analysis. Usually the network department of the host operator hates it and so does the marketing department. The financial department loves it secretly.
Here it is analyzed from all aspects - also from the aspect of the entrant operator making use of it.

The author of the material here is Thorleif Herrstrom who has spent the last 40 years in the telecom business both as a consultant and as a top level manager. For the one who wants detailed information a CV can be found at http://www.linkedin.com/in/thorleif