If the plane had come out of America, we would be screaming and demanding that we be told where the heck those phones are..and lawyers would be getting involved.
I guess they are a little more laid back in Asia.
Yeah, it shouldn't do that but you get all sorts of inconsistent behavior when calling a phone that is out of range or turned off.
With STOOPID Sprint you can call someone and hear a ring and that means nothing. For years Sprint’s system lies. I can be holding the receiving phone with bars on it, and yet 100 feet away the same Sprint account phone is calling it. Bars on both, ringing tone on the calling phone and yet silence from the so called receiving set.
btw: If I turn the receiving phone off. The call will go straight to voice mail. That does work as intended.
In the old landline days the ring tone actually was the same electric signal induced on the wires from the ringing voltages at the other end. That’s why we used to hear weird ring sounds when calling far away. That’s when society held some honesty.