Sometimes when I call my partner In Thailand from Australia my number comes up but sometimes it says my number is a thai number? Does anyone know why this happens? Is it just a crossed line? And no she doesn't have someone else

Cheers

Moved to the internet and communications forum.

It's normal. Just depends on the Thai gateway being used by your Australian operator. Generally speaking if you use +66 as the access code the mobile number is passed on but if you use another access code which offers cheaper rates it isn't. It can vary though.

I can just confirm that it happens not knowing exactly whats behind.

Sometimes we got calls from Germany showing up as a Bangkok number.

A first-class (TDM and SS7) legacy circuit would always present the correct calling number.

But as indicated above, in these days things are different, telcos aim for cost not quality, do use VoiP and gateways so that the number is lost.