I am also finding difficult to change my country to Malaysia where I am currently pursuing my PhD. I have given input on the addresses and the rest. It's only the phone number, where I can't change the country.
I am having the same problem. My permanent address is in the US but I spend about 25% of the year in Chile where I do not have access to my USA phone. Can you change my country to Chile so I can receive the text?
Also, can I change my country later back to the US when I return there?