Iphone 3GS unlocked 16GB in white. ?

Hi I am selling my white Iphone 3GS. The phone is in excellent condition with an immaculate screen. The phone has been officiall unlocked through Apple and can be used on any network. Please note : My son changed the baseband on this phone and it can no longer accept the updates from Apple.( now on IPad baseband ) Otherwise the phone works perfectly , calls,texts, buying apps, internet, wi-fi, video camera, camera, music. Any questions please ask.