I'm french and i will visited thailand in few days for the first time.
I'm interesting in to buy a tourist sim card to get data and call. But if i want to call in france from thaildand i don't understand what is the difference between Premium quality calling via "+" and Save & Crystal Clear quality calling via 003 prefix.
Thanks a lot
Maybe my question is bad.
Why there is two different way to call ? Premium quality and save and crystal clear ?