I once went on a trip with some of my colleagues at work. Usually when I travel, I would call my wife at intervals just to touch base, to let her know how my journey was progressing and to put her mind at ease about my safety.Somewhere along the journey however, I was not able to place any calls because we were travelling through a route outside of the mobile phone operator’s coverage area. At intervals, I would check the screen of my mobile phone and it would show up blank. It was usually at times like this that I would have an urgent need to call my wife, possibly to pass on some information I didn’t remember earlier. I would stare at the screen of my phone willing the logo of the mobile operator to show.As the journey progressed without gettin...