Thank you. I really appreciate any further info on this. It was new to me.
I first tried at a shop of the Swedish "national carrier" Telia. They were helpful and tried different SIM-cards but with no effect. "SIM-card not found".
Phone worked in Thailand and South Africa. Not in Turkey and Sweden.
Telia is most reliable and I do not wish to change number.
Phone repair shops seem not to know. I go back on Monday if regular staff is there.
An important limitation I did not know about.
WillMyPhoneWork.net is probably wrong? My phone doesn't even recognize the SIM.
I though I had a good idea. Buy a phone which at that time was not sold in Europe. Competition is so hard in Asia that such offers would compete negatively on other markets is my guess.
But what did I get? The world's smallest and heaviest tablet. Among phones it has excellent battery time, but for a tablet it is poor.
My Note 3 was bought in Brazil, very high price. It has worked in S.Am, Europe, Africa, Asia. I think Samsung introduced this limitation to the Galaxy 9 Pro, just so people could not bring them from low priced to high priced markets. I don't mind that but they ought to tell.