In order to set up a new octopus which worked with my galaxy watch, I purchased a second-hand Samsung phone today. (S8). Seems nice. Downloaded Samsung pay and could not find octopus. Turns out it was a Singapore phone. So I rang Samsung and they said it's impossible to change a Singapore phone to a HK phone. Googled and discovered a code to type in to change the CSC.... But the HK code did not show up. However the Taiwan code did. So I selected that thinking perhaps if I make a small change the HK code will show up later. Well that works. Phone now thinks it's a Taiwan phone....BUT the code I typed in (*#272*IMEI number#, I think) no longer does anything! No idea why.
Anyone any idea what to try next? I've googled but the very detailed posts confuse the heck of out me....