Please see attached. ThanksCould you go to Software Info on your device, scroll down to "Software Serviceprovider" and post that info here (screenshot)...
When I tried the Thailand Sim trick, some of the phones picked up thailand regions such as Samsung themes and there was option in call setting to use 'Hiya' the thailand caller ID protection service. Note there was never the usual message of asking if I want to apply the regional settings upon hard reset with this sim though. I note on a Samsung forum it suggests that a sim can be only used once. As I've used this to change for my Note8, it may not work anymore. This however, I find a bit strange why that would be the case.
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