Hello, I'm in Brazil and I have 3 R600, but I can not change the country code, so I can not leave these phones working, why? Thank you, I await an answer.
You must buy APs with the country code of the country that they will be used in only. You cannot run other country code APs except in the country they are intended to be used in, because of Federal radio band restrictions, etc, ie FCC rules.
