mobile phone

Previously phones were attached to a cord and you generally needed to be inside a building to use them. Now with mobile phones the question is not ‘how are you?’, the new question is ‘where are you?’ This highlights how new products alter the way we think.
For most of us, the only limit to our mobile phone usage is the telephone coverage provided by our service provider. If you want total global coverage you might have to upgrade to a satelite phone.