Types of calls

 Mayor call 

Happens when the mayor calls all government officials to their location. The picture of where you should go is indicated with a green person with ribbons on the person. You only get this call as a government role.

 Stolen Vehicle 

For police and tow truckers, used when someone's vehicle got stolen. Indicated with a red car with a criminal next to it.

 Backup 

Used by police, swat, and I think military. It will ask almost all government officials to go assist you. Indicated with a orange person holding a gun.

 Taxi, Police, Tow Trucker, and Paramedic Calls 

Used by other services, indicated with a blue phone sign. Money will be received for going to the location.