@Vincenzo -- Here is another time when a two way radio does the job a smartphone can't. Think about emergency dispatchers. There is another time when a dispatcher needs to communicate to everyone tuning in on a frequency so police, firemen, etc. can all respond to an emergency and coordinate their activities.
If we relied on smartphones for such coordination, the job might get done. But the 2 way radio makes it a heck of a lot more efficient. When seconds count, you want as efficient a system as possible. You just can't beat a central dispatcher who can communicate with everyone at once, receive information from everyone in the field and then relay that out to other emergency responders. The two way radio may be old technology, but it is efficient and works very well.