i bought this AT&T w580i phone,i could not use mp3 files as my ringtone so i search the forum and i was able to get this thread which helped me to flash my phone.now i dont have the AT&T firmwire on my phone but i cannot unlock the network.it ask for NCK number and i dont know it,please please please im a newbie can someone please help me get a NCK code to unlock the phone:. thank you .confused: