@rahasya: I am not aware about the brother, that might be true. I actually asked with one of my co-worker and he suggested me to do it. I did unlocked two iphone 4s few weeks ago but, as you said those phones are in Nepal. I send the phone to Nepal first and activated later with IMEI number. Since i work for Sprint so so i didn't have to call in order to activate but yes i did called the number i mentioned avove to unlock and it worked. I don't know whether it will work here or not. TY.