not all android phones working

I have 3 different brand android phones. Using same settings and same gsm provider i have 3 different status for each phone: green, orange, red. How come?

Thank you.

With the amount of information you provided it's not possible to tell.

What other info you need? If i knew where to look for extra info probably I could solve the problem. Since one phone manage to connect to my server and other 2 use the same gsm provider and same settings how come that are not connecting?

You should start by checking location settings in Android and looking at the status screen in the app.