I can't get through. 我打不通电话。
get through 用电话联系上；打通电话
I tried to call her but couldn't get through.
I got through to the wrong department.
Look, I can't get through to this number.
I tried calling you several times but I couldn't get through.
I couldn't get through—the line's engaged.
Callers dialling the wrong area code will not get through.
Nope, the line is busy—I can't get through.
I called her on the telephone time after time, but I couldn't get through to her.