We shouldn't have a mandatory jury system in Australia since there might be interest in a career of jury judy as a future job or hobby. Also, not all people want or feel they need to take part in jury judy when they could be doing other things in the mean time.
Mobile phones I believe are a want. Mobile phones have not been around forever even though it is a type of communication. Instead of the communication of texting, calling & video chatting, many past people had communicated through speech, scripture & interaction.
Within the 21st century, I believe that a phone is a need. Here at St Brigid's Catholic College, we use modern technology everyday to pursue our ideas & learning. We share each other's learning & work everyday through the internet system.
When one of these network connecting devices slow down or crash, we need another device source. That's when a mobile phone comes into play. I know as a fact that my mother uses her phone to check the news letter & emails for both St Brendans & St Brigid's. These emails & notices being a need.