I just bought Asus ROG phone 8 pro.but I can't make a call or dial number.

[MiroS]

I dont have this problem , dialer works fine for me ...

[Zeus92]

It always says connection problem or invalid mmi code.

[MattWojo]

I had this problem when I originally got my ROG phone 6 about a year ago. My issue was that I had Verizon and Verizon does not support ROG phones at all. I had to switch to AT&T to be able to use the phone.

[Zeus92]

What does AT&T means?.where can I find it.sorry but I really don't have any idea what is that