app developer

I have 10 trucks. I want a gps tracking software to install on the drivers smart phones. Some have apple iphones and the rest are android phones. As I will be adding more drivers I want to be able to add and delete other phones. I want a user friendly interface map for my computer Google maps preferably) that I can see where my drivers are in real time. No time lagging. I also want an app for the phones. I want the drivers to be able to see where the other drivers are and by touching the phone screen on any of the driver’s icons it will ring that driver’s phone.