impossibility to have a voice call
Hello, i’m using a french operator because i live in France. When i arrived to USA, it switched on AT&T and everything was working very well until Saturday.
On Saturday, i received this text message from AT&T : “Welcome, you are roaming on AT&T. Due to network technology compatibility, traditional voice calls will not work. Please use data, SMS, and app-based calling.”
So since this day, i can’t have voice calls and i don’t understand why because my french operator tell me that i can.
Thank you for the help .