What is error code 406 and how do you fix it?

[AC Question]

I have a Galaxy SII phone and ever since I bought it, it gives me the error code of 406. No one can tell me why. I can't do regular updates and can't download anything because of this error code. How do I fix it? It's a good phone other than that. I want to use all of the phone, not just phone calls and internet. Help me, Please!! ANYONE!!